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3-8
Voltage measurements (DCV and ACV)
The Model 2790 can make DCV measurements from 0.1µV to 1000V and ACV measure-
ments from 0.1µV to 750V RMS, 1000V peak.
DCV input resistance:
ACV input impedance:
DCV input divider
Normally, the input resistance for the 100mVDC, 1VDC, and 10VDC ranges is >10GΩ,
while the input resistance of the 100VDC and 1000VDC ranges is 10MΩ. However, the
input resistance for the three lower DCV ranges can also be set to 10MΩ by enabling the
input divider.
With the input resistance lowered, a more stable 0V reading is achieved with an open
input. Also, some external devices (such as a high voltage probe) must be terminated to a
10MΩ load.
The input divider cannot be enabled from the front panel. For remote programming, the
following command controls the input divider:
VOLT:IDIVider <b>
Connections
klqb
t^okfkd
klqb
Front panel input
When using the front panel input terminals, connect the test leads to the INPUT HI and
LO terminals as shown in
Model 2790 SourceMeter
100V and 1000V ranges: 10MΩ
100mV, 1V, and 10V ranges: >10GΩ || <400pF or 10MΩ
1MΩ || <100pF
' Enable (ON) or disable (OFF) the DCV input divider.
Switching module connections shown in this section are specifically for the 7702
module. Test connections for the 7751, 7752, and 7753 modules are provided in
the Model 2790 User's Manual.
Even though the Model 2790 can measure up to 1000V peak, the maxi-
mum input to a switching module is less. Exceeding the voltage rating
of a switching module may cause damage and create a safety hazard.
When using the front panel inputs, the INPUTS switch must be in the "F" (out)
position. For switching modules, it must be in the "R" (in) position.
Figure
3-2.
®
Swich System Reference Manual
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