Keithley 2701 User Manual

Model 2701 User’s Manual Scanning 7-19
NOTE An overflow reading (“OVRFLW” message displayed) is interpreted by the
Model 2701 as a positive reading, even if the input signal is negative. This could
inadvertently trigger a monitor scan (see “Scan operation — Monitor scan,”
page 7-35).
The monitor channel must be a channel that is in the scan list. If the monitor
channel is removed from the scan list, the lowest channel in the scan list will
become the monitor channel.
To set monitor, the instrument can be in the normal measurement state or enabled while in
the advanced scan menu. There are two methods to select a monitor channel: Method 1
selects it while a channel is closed and Method 2 selects it with no channels closed.
NOTE The monitor channel must be a channel that is in the scan list.
Method 1:
1. Use the CLOSE key or the
 and  keys to close the channel that you want to be
the monitor.
2. Press SHIFT and then MONITOR (MON annunciator turns on).
Method 2:
1. If a channel is closed, press OPEN to open it.
2. Press SHIFT and then MONITOR.
3. Use the , , , and  keys to display the monitor channel (i.e., MONITOR 101)
and press ENTER. The monitor channel closes and the MON annunciator turns on.
To disable monitor, again press SHIFT and then MONITOR (MON annunciator turns off).
Once enabled, you can change the monitor channel using the CLOSE key or the  and 
keys. If you open the monitor channel, the monitor does not disable but it does become
inactive (MON annunciator turns off). When a channel is closed, monitor becomes active
(MON annunciator turns on).
While in the normal measurement state, the present monitor channel dictates which
channel in the scan list is the monitor. Therefore, if you change the monitor channel, the
scan list monitor channel also changes.
When you change the monitor channel while in the normal measurement state, the
instrument setup does not change. If you want the monitor channel to assume the setup of
the scan list channel, you must disable the monitor and then re-enable it.

Keithley 2701 Specifications

General

Max Voltage	300 V
Max Current	3 A
Frequency Range	3 Hz to 500 kHz
Frequency Accuracy	0.01%
Weight	3.6 kg
Measurement Functions	Frequency, Temperature
Interface	IEEE-488 (GPIB), RS-232
DC Voltage Range	300 V
DC Current Range	3 A
AC Voltage Range	300V
AC Current Range	1 μA to 3 A
Resistance Accuracy	0.01%
Channels	10
Dimensions	213mm x 88mm x 370mm