Keithley 2700 User Manual

E-8 Measurement Considerations Model 2700 Multimeter/Switch System User’s Manual
Shielding
WARNING Do not float input LO more than 30V rms, 42.4V peak above earth
ground with an exposed shield connected to input LO. To avoid a
possible shock hazard, surround the LO shield with a second safety
shield that is insulated from the inner shield. Connect this safety shield
to safety earth ground using #18 AWG minimum wire before use.
Proper shielding of all signal paths and sources being measured is important to minimize
noise pickup in virtually any low-level measurement situation. Otherwise, interference
from such noise sources as line frequency and RF fields can seriously corrupt
measurements, rendering experimental data virtually useless.
In order to minimize noise, a closed metal shield surrounding the source may be
necessary, as shown in the example of
Figure E-4. This shield should be connected to
input LO in most cases, although better noise performance may result with the shield
connected to chassis ground in some situations.
Figure E-4
Shielding example
HI
LO
DUT
A
2182
Noise
Shield
Connect noise
shield to LO.
Connect safety shield to a
known safety earth ground using
#18 AWG wire or higher.
Safety
Shield
WARNING: Safety shield required when
floating noise shield >30V rms
above chassis ground.
2700

Keithley 2700 Specifications

General

Type	Digital Multimeter
Measurement Functions	DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Temperature Range	-200°C to +1372°C
Display	Vacuum Fluorescent Display
Connectivity	IEEE-488, RS-232
Channels	10
Power Supply	100V to 240V AC, 45Hz to 66Hz
DC Current Range	10 µA to 3 A
AC Current Range	10 µA to 3 A
Temperature Measurement	Thermocouple, RTD