Keithley 1801, Инструкция по эксплуатации, Страница: 29 / 93

Operation
3-6
Saving setups
Model 1801 setups can be saved by using the
SAVESETUP selection in the front panel menu. (See
paragraph 3.12.1 of the Model 2001 Operator’s Manual
for details.) In order to save a preamplifier setup, select
the desired operating conditions, then save your setup as
usual. To turn on the Model 1801 when the setup is
recalled, first enable the preamplifier before saving the
setup. To turn off the preamplifier when the setup is
recalled, disable the preamplifier before saving the setup.
Recalling setups
The state of the Model 1801 depends on the type of setup
being recalled: GPIB defaults, bench defaults, or user
setup.
■
GPIB defaults
When GPIB defaults are recalled, the Model 1801 is
always disabled. GPIB defaults are restored with the
RESET GPIB selection in the save setup menu, or by
sending the *RST command over the bus.
■
Bench defaults
When bench defaults are recalled, any internal conflicts
(such as auto-range) with the present operating state are
resolved, and the Model 1801 is enabled with the factory
default operating conditions summarized in Table 3-6.
Bench defaults can be recalled by using the RESET
BENCH selection in the save setup menu, or by using the
bus :SYSTem:PRESet command.
■
User setups
When a user setup is recalled, the Model 1801 operating
state assumes the condition dictated by the recalled setup.
If the setup was stored with the Model 1801 disabled, the
preamplifier will be disabled when the setup is recalled. If
the setup was stored with the Model 1801 enabled, the
preamplifier will be enabled when the setup is recalled,
and the instrument will assume operating conditions from
the recalled setup.
Notes:
1. If a recalled setup requires that the Model 1801 be
enabled, and the preamplifier is not installed in the
Model 2001, a “Missing hardware” error will be gen-
erated. The Model 2001 will then assume its bench
default conditions.
2. The preamplifier hardware gain is set to X1,000, and
the filter response is set to medium when the Model
1801 is disabled.
Multiple displays
The following multiple displays are not available when
using the Model 1801:
• DCV: positive, negative, or positive/negative peak
spikes; ACV frequency; simultaneous DCV/ACV.
• ACV: crest factor, frequency.
• FREQ: period
Table 3-5
Preamplifier measurement ranges
Function Ranges
DCV
ACV
Ω
4W
20µV, 200µV, 2mV
500µV RMS
2m
Ω
, 20m
Ω
, 200m
Ω
, 2
Ω
, 20
Ω
, 200
Ω
Frequency* 2mV
* Maximum threshold level range.
Table 3-6
Factory default conditions
Function or operation Factory default
Function
DCV Range
ACV Range
Ohms Range
Ohms Offset Compensation
Frequency Threshold Range
Frequency Threshold Level
Temperature Transducer
Filter Response
DCV
2mV
500µV
200
Ω
On
2mV
0V
Differential
Thermocouple
Medium