Operation
3-5
3.2.6 Operational differences
Functions
The following functions are available when using the
Model 1801:
•
DC volts
•
AC volts (low-frequency RMS only)
•
4-wire ohms
•
Frequency (voltage only)
•
Thermocouple temperature (differential only)
Note that DC current, AC current, and 2-wire ohms func-
tions are not available when the preamp is turned on. The
following message will be displayed if you attempt to
Figure 3-1
Filter frequency response curves
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.001
0.01
0.1
1
10
100
1k
10k
100k
dB
Gain
Frequency (Hz)
NOTE : Response curves are for preamplifier only.
Number corresponds to conditions listed in
Table 3-4.
1
2
3
4
5
6
7
select one of these functions when the Model 1801 is
enabled:
Function is not available with Preamp enabled
Ranging
Table 3-5 summarizes the measurement ranges available
when using the Model 1801. Note that auto-ranging can-
not be used when the preamplifier is enabled. If you
attempt to use auto-ranging with the preamp turned on,
the instrument will display the following message:
Auto-ranging is not available with Preamp enabled