3-8 Basic DMM Operation Model 2701 User’s Manual
Voltage measurements (DCV and ACV)
The Model 2701 can make DCV measurements from 0.1µV to 1000V and ACV
measurements from 0.1µV to 750V RMS, 1000V peak.
DCV input resistance: 100V and 1000V ranges: 10MΩ
100mV, 1V, and 10V ranges: >10GΩ || <400pF or 10MΩ
ACV input impedance: 1MΩ || <100pF
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> ' Enable (ON) or disable (OFF) the DCV input divider.
Connections
WARNING Even though the Model 2701 can measure up to 1000V peak, the
maximum input to a switching module is less. Exceeding the voltage
rating of a switching module may cause damage and create a safety
hazard. When making connections to an external circuit, always use
test leads that are rated for the available voltage and current.
NOTE 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.
Front panel input
When using the front panel input terminals, connect the test leads to the INPUT HI and
LO terminals as shown in Figure 3-2.
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