Operation
Publication 21555, Rev. E, September 2002
2-57
Gain = 1, Amp 2:
1200
1000
950
1050
GAIN = 1, AMP 2
This test sets the sensor input amplifier offset
DAC to 1 volt and measures the output of the
second stage amplifier with its gain set to 1. It
then compares the results with the limits shown to
the left and if outside any limit it will set the error
number corresponding to that voltage level. Then
it sets the gain of the second stage to 8 and
measures the output of that stage. Any out of
tolerance voltage will be indicated by a
corresponding error number. This checks the gain
of this stage at a gain of 8.
Gain = 8, Amp 2:
1201
8000
7200
8800
Gain = 1, Amp 2:
1400
100
90
110
GAIN = 1, AMP 2
This test sets the sensor input amplifier offset
DAC to 0.1 volt and measures the output of the
second stage amplifier with its gain set to 1. It
then compares the results with the limits shown to
the left and if outside any limit it will set the error
number corresponding to that voltage level. Then
it sets the gain of the second stage to 64 and
measures the output of that stage. Any out of
tolerance voltage will be indicated by a
corresponding error number. This checks the gain
of the second stage at a gain of 64.
Gain = 64, Amp 2:
1401
6400
5760
7040
1600
9000
8000
10000
TOO HIGH
This test checks the upper limit for the auto-range
system by applying a voltage from the offset DAC.
The output of the second stage is monitored while
also monitoring the ! too-high comparator output.
If the comparator output comes true outside of the
voltage limits specified to the left the
corresponding error number is set.
1800
1000
700
1100
TOO LOW
This test checks the lower limit for the auto-range
system by applying a voltage from the offset DAC.
The output of the second stage is monitored while
also monitoring the ! too-low comparator output. If
the comparator output comes true outside of the
voltage limits specified to the left the
corresponding error number is set.
2000
7000
6300
7700
CAL HEATER
This measures the calibrator thermistor heater
voltage. This is half of the actual voltage on the
heater transistor collector which will be about
0.5 volts below the level of the 15 volt supply after
the heater is stable. Since this takes about a
minute after power on the POST does not check
this. However the command *TST? does.
2100
0
0
500
SW +5 OFF
This test measures the switched 5 volt logic
supply applied to the sensor when it is switched
off. Whenever a peak power sensor (8034X or
8035XA) is connected, this test will be bypassed.
Table 2-5: Self-Test Error Indication & Limitations (Continued)
Error Number
Result
Minimum
Maximum
Test Description
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