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Measuring Access Probe Power
Last updated: December 12, 2006
General Procedure
Channel power calibration should be performed if the test set is being used for the first time or the operating environment has changed significantly since the last calibration was performed. The channel power calibration also calibrates the access probe power measurement. See
Calibrating the Test Set
for details.
-
Connect the mobile station's antenna output to the test set's front panel RF IN/OUT connector and power them on.
-
Press the blue
SHIFT
key and then the green
Preset
key to full reset the test set.
-
Initialize the access probe power measurement:
-
Press the
Measurement selection
key.
-
Turn the knob to highlight the
Access Probe Power
measurement and press the knob.
-
Press the Access Probe Power Setup (
F1
) to access the
Access Probe Power Setup
menu. Use the knob and DATA ENTRY keys to set the measurement parameters as needed for your measurement situation. (Some parameters can also be set from the Access Parameters menu in step 3).
If you wish to only capture the first access probe, set
Trigger Arm
to
Single
and press the
START SINGLE
key to start the measurement. When the
Trigger Arm
is set to
Continuous
, the test set will display the power level of the most recently measured access probe.
-
Press the
Close Menu
(
F6
) key.
-
Set the test set to ignore all access attempts by setting
Call Limit Mode
to
On
(
F10
on the
Call Parms 2 of 3
menu). See
How Do I Change Call Parameters?
for details.
It is recommended that you always turn the call limit mode on when measuring access probe power. The easiest way to induce access probes from the mobile station is to page the mobile station. If you do not have call limit mode set to on, when you page the mobile station, the connection will complete, which clears the access probe power result from the measurement screen.
Set call limit mode back to off when you have finished measuring access probe power.
-
Set the
Timer Based Registration State
to
Off
(see
D. Registration Parameters
). It is to prevent an access probe power measurement from being triggered by the unexpected mobile station registration.
-
Set the access parameters (such as power step, number of steps, etc.) as needed for your test situation. See
C. Access Parameters or Enhanced Access Parameters
for details.
-
Press the
START SINGLE
key if you set
Trigger Arm
to
Single
in step 4.
-
Press the
CALL SETUP
key, then press the
Originate Call
(
F3
) key.
-
Press the
MEASUREMENT
key, observe the measurement results. A typical display is shown below.
-
After finishing the measurements:
-
Press the
End Call
(
F3
on the
Call Control
1 of 2
menu).
-
Turn the
Call Limit Mode
back to
Off
.
-
Turn the
Timer Based Registration State
back to
On.
-
Turn the access probe power measurement off by pressing the
Measurement selection
key, selecting
Access Probe Power
, then
Close Measurement
(
F4
).
If the access probe power measurement is on and waiting to measure a probe, all other measurements (except digital average power) will not be able to execute. It is therefore recommended that you turn off the access probe power measurement before attempting any other measurements.
Testing 4.4.1 Range of Open Loop Output Power
Definition:
This test measures the range of the estimated open loop output power. The mobile station estimates its open loop mean output power from its mean input power.
The test set support both Access Channel and Enhanced Access Channel (see
C. Access Parameters or Enhanced Access Parameters
for procedure on how to configure).
The following test procedure is based on Access Channel and assumes that the mobile station is Class II and supports Band Class 1 (US PCS). You should change the settings as specified for other configurations. Unless otherwise stated, set all parameter settings to their defaults. For details on performing the steps below, see the
General Procedure
above.
-
Connect the mobile station's antenna output to the test set's front panel RF IN/OUT connector and power them on.
-
Press the blue
SHIFT
key and then the green
Preset
key to full reset the test set.
-
Initialize the access probe power measurement:
-
Press the
Measurement selection
key.
-
Turn the knob to highlight the
Access Probe Power
measurement and press the knob.
-
Press the Access Probe Power Setup (
F1
) to access the
Access Probe Power Setup
menu. Use the knob and DATA ENTRY keys to set the measurement parameters as specified for the test.
If you wish to only capture the first access probe, set
Trigger Arm
to
Single
and press the
START SINGLE
key to start the measurement. When the
Trigger Arm
is set to
Continuous
, the test set will display the power level of the most recently measured access probe. Observe the display changes.
-
Press the
Close Menu
(
F6
) key.
-
Press the
CALL SETUP
key, set the
Cell Band
(
F8
) to
US PCS
.
-
Set the test set to ignore all access attempts by setting
Call Limit Mode
to
On
(
F10
on the
Call Parms 2 of 3
menu).
-
Set the
Timer Based Registration State
to
Off
(see
D. Registration Parameters
) to prevent an access probe power measurement from being triggered by the unexpected mobile station registration.
-
Set the access parameters as specified (see
C. Access Parameters or Enhanced Access Parameters
for details).
-
Set
Preamble Size
(PAM_SZ) to 15.
-
Set
Maximum Response Sequence
(MAX_RSP_SEQ) to 1.
-
Set
Cell Power
(Î
or
) (
F7
on the
Call Parms 1 of 3
) as specified:
-
Test 1:
-25 dBm/1.23 MH
-
Test 2:
-65 dBm/1.23 MH
-
Test 3:
-97 dBm/1.23 MH
(depending on Band Class)
-
If you set the
Trigger Arm
to
Single
in step 4, press the
START SINGLE
key. If you set the
Trigger Arm
to
Continuous
, skip this step.
-
Press the
CALL SETUP
key, then press the
Originate Call
(
F3
) key.
-
Press the
MEASUREMENT
key, observe the measurement results. A typical display is shown below.
-
After finishing the measurements, press the
CALL SETUP
key, then press the
End Call
(
F3
).
-
Repeat the steps 10-14 for test 2 and test 3.
-
After finishing all measurements:
-
Turn the
Call Limit Mode
back to
Off
.
-
Turn the
Timer Based Registration State
back to
On.
-
Turn the access probe power measurement off by pressing the
Measurement selection
key, selecting
Access Probe Power
, then
Close Measurement
(
F4
).
If the access probe power measurement is on and waiting to measure a probe, all other measurements (except digital average power) will not be able to execute. It is therefore recommended that you turn off the access probe power measurement before attempting any other measurements.
Testing 4.4.3 Access Probe Output Power
Definition:
This test verifies the following Access Channel and Enhanced Access Channel parameters: nominal power offset, initial power offset, power increment between consecutive probes, number of access probes in one probe sequence, and the number of probe sequences in one mobile station page response access attempt.
The test set support both Access Channel and Enhanced Access Channel (see
C. Access Parameters or Enhanced Access Parameters
for procedure on how to configure).
The following test procedure is based on Access Channel and assumes that the mobile station is Class II and supports Band Class 1 (US PCS). You should change the settings as specified for other configurations. Unless otherwise stated, set all parameter settings to their defaults. For details on performing the steps below, see the
General Procedure
above.
-
Connect the mobile station's antenna output to the test set's front panel RF IN/OUT connector and power them on.
-
Press the blue
SHIFT
key and then the green
Preset
key to full reset the test set.
-
Initialize the access probe power measurement:
-
Press the
Measurement selection
key.
-
Turn the knob to highlight the
Access Probe Power
measurement and press the knob.
-
Press the Access Probe Power Setup (
F1
) to access the
Access Probe Power Setup
menu. Use the knob and DATA ENTRY keys to set the measurement parameters as specified for the test.
If you wish to only capture the first access probe, set
Trigger Arm
to
Single
and press the
START SINGLE
key to start the measurement. When the
Trigger Arm
is set to
Continuous
, the test set will display the power level of the most recently measured access probe. Observe the display changes.
-
Press the
Close Menu
(
F6
) key.
-
Press the
CALL SETUP
key, set the
Cell Band
(
F8
) to
US PCS
.
-
Set
Cell Power
(Î
or
) to
-65 dBm/1.23 MHz
(
F7
on the
Call Parms 1 of 4
) and
Cell 1 F-Pilot Level
to
-5dB
(
F3
on the
Call Control 2 of 5
, then press
F2
).
-
Set the test set to ignore all access attempts by setting
Call Limit Mode
to
On
(
F10
on the
Call Parms 2 of 3
menu).
-
Set the
Timer Based Registration State
to
Off
(see
D. Registration Parameters
) to prevent an access probe power measurement from being triggered by the unexpected mobile station registration.
-
Set the access parameters (such as initial power, power step, number of steps, etc.) as specified for the test (see
C. Access Parameters or Enhanced Access Parameters
for details).
-
Test 1: Set all parameters to the defaults.
-
Test 2: Set
Nominal Power
(NOM_PWR) to 3 dB,
Initial Power
(INIT_PWR) to 3 dB,
Power Step
(PWR_STEP) to 1 dB,
Number of Steps
(NUM_STEP) to 4,
Maximum Response Sequence
(MAX_RSP_SEQ) to 3.
-
If you set the
Trigger Arm
to
Single
in step 4, press the
START SINGLE
key. If you set the
Trigger Arm
to
Continuous
, skip this step.
-
Press the
CALL SETUP
key, then press the
Originate Call
(
F3
) key.
-
Press the
MEASUREMENT
key, observe the measurement results.
-
After finishing the measurement, press the
CALL SETUP
key, then press the
End Call
(
F3
).
-
Repeat the above steps 10-14 for Test 2.
-
After finishing all measurements:
-
Turn the
Call Limit Mode
back to
Off
.
-
Turn the
Timer Based Registration State
back to
On
.
-
Turn the access probe power measurement off by pressing the
Measurement selection
key, selecting
Access Probe Power
, then
Close Measurement
(
F4
).
If the access probe power measurement is on and waiting to measure a probe, all other measurements (except digital average power) will not be able to execute. It is therefore recommended that you turn off the access probe power measurement before attempting any other measurements.
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