Operating Guide
4
Keysight N4000/1/2A Operating and Service Manual
37
9
If this value has not changed, warm the SNS by wrapping your hand around its
bulkhead as shown in
for 20 seconds. This gives the SNS
thermometer time to change its ambient value. Then press the
User Tcold
From SNS
menu key again. The new ambient temperature value is displayed.
Figure 4-8
Operator’s check for T
cold
upload from SNS
10
If the value does not change, return the SNS to Keysight Technologies for
repair.
Operator’s check for switching noise source off and on
The following procedure checks that the SNS can switch the noise source off and
on. This ensures the excess noise switches.
1
Remove any cables from the NFA input and SNS drive.
2
Press the
Preset
key. Wait until the preset routine has completed before
proceeding.
NOTE
The preset condition used is the NFA default of
Preset (Factory)
.