Keithley 610C, Инструкция по эксплуатации

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b. Static Measurements.
Static charge can
be measured using the 6l0C when used with either
Keithley accessory Models 2501 or 2503 Static De­
tector probes.
In this application the 6l0C is used
in the VOLTS mode. The charge is measured in terms
of volts using the capacitive divider of the Static
Detector.
NOTE
For information concerning Static Charge measure­
ments, request the Product Note entitled "Elec­
trometer Static Charge Measurementsll• The Model
6l0C should be used with Keithley Models 2501
and 2503 Static Detector Probes for Static Charge
Measurements.
Do not attempt to use the Model
6l0C in the COULOMBS mode for Static Charge
measurements since the Electrometer is very
sensitive to charge transients.
2-7. RECORDER OIlrPUTS.
a.
This output can be used
to monitor the 6l0C using either voltage or current
responding recorders.
1. Voltage Output: +3 volts for full scale input.
Internal resistance is
3
kilohms. Output polarity
is opposite input polarity. To use this output set
the lMA-3V switch to 3V. This output is suitable
for use with voltage recorders, oscilloscopes, digi­
tal voltmeters, etc. which have at least 300 kil­
ohms input resistance.
I
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L
- -----------
- --
R176
8.6kQ
CW
Rl77
20kn
MA
CAL
MODEL 610C
--
- - - --
--,
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-.J
NOTE
In the FAST mode the OUTPUT is floating with
respect to chassis ground.
2. Current Output: +1 milliampere for full scale
input, variable +5% with 1400 ohm recorders. To use
this output set the lMA-3V switch to lMA. This out­
put is suitable for use with recorders which respond
to current such as the Keithley MOdel 370 Recorder.
The lMA CAL (R177) can be used to set full scale for
the particular recorder in use.
b. Servo Rebalance Recorder For some types
of recorders a divider network is required to provide
a
sOmv
or lOOmV full scale output. In this applica­
tion the lMA-3V switch should be set to lMA. The di­
vider resistors should be selected to provide a volt­
age suitable for the recorder in use. -A typical ex­
ample is shown in Figure
9. The full voltage output
is 3V. Therefore, the total divider resistance should
be 3000 ohms. The voltage drop across the lOOn re­
sistor is then adjusted for 100mV by adjusting the
1MA CAL control.
c. (JI05�. This output can be
used for measurements from very high source impedance.
The
Xl
output is equal to input within IOppm at d-c,
exclusive of noise and drift, for output currents not
exceeding 100 microamperes.
Output polarity is the
same as input polarity. This terminal cannot be used
in
FAST mode.
J103
OUTPUT
1 MA_
1
3kQ
DIVIDER NETWORK
too
lOOn
millivolt
output
2
FIGURE 9.
Recorder Output, 100 mV Divider Network.
8