Procedure; Zero Test Results - HP E4418A Service Manual

Performance Tests
Zero Test

Procedure

The following procedure should be performed for the Zero Test.
Note
Note
2-6
The procedure details the key presses required on the
HP EPM-441A. For the HP EPM-442A the equivalent key presses
should be performed on both channels.
1. Connect the equipment as shown in Figure 2-1.
2. Switch the power meter on.
Preset
3. Press then
Local
dBm/W
4. Press ,
W
5. Set the range calibrator as follows:
RANGE............................................ 3 µ W
POLARITY ...................................... NORMAL
FUNCTION..................................... STANDBY
LINE................................................ ON
When switching the range calibrator to STANDBY, allow enough
time for the range calibrator to settle to its zero value before
attempting to zero the power meter. This settling would appear on
the power meter display as downward drift. When the drift has
reached minimum, (typically less than 60 seconds), the range
calibrator is settled.
6. On the power meter press
select 512 from the pop up window then press
7. On the power meter press
disappears press
wait symbol to disappear.
8. Wait 30 seconds then verify that the power meter's reading is
within ± 0.05 µ W. Record the reading.
Table 2-2: Zero Test Results
Channel A
Min
Actual Result
-76.40 nW ________________
.
Confirm
for a reading in watts.
System
,
Input Settings Filter
Inputs
Zero
, . When the wait symbol
Cal
Cal
. Wait approximately 10 seconds for the
Zero
Channel B
Actual Result
(HP EPM-442A
Only)
________________
HP EPM-441A/442A Service Guide
,
Enter .
Max
+76.40 nW