Keithley 2700 Service Manual

A-14 Specifications
Thus, the actual reading accuracy is 10mV ±36mV or 10.036mV to 9.964mV. Applying the
voltage reading accuracy into the dB equation yields:
Thus, the actual reading accuracy is -60dB + 0.031213dB to -60dB - 0.031326dB.
dBm and dB for other voltage inputs can be calculated in exactly the same manner using
pertinent specifications, ranges, and other reference voltages.
Additional derating factors
In some cases, additional derating factors must be applied to calculate certain accuracy val-
ues. For example, an additional derating factor of 0.02ppm/V must be added to DCV specifica-
tions for voltages over 500V. Before calculating accuracy, study the associated specifications
very carefully to see if any derating factors apply.
Optimizing measurement accuracy
The configurations listed below assume that the multimeter has had factory setups restored.
DC voltage, DC current, and resistance:
• Select 6-1/2 digits, 10 PLC, filter ON (up to 100 readings), fixed range.
• Use REL on DC voltage and 2-wire resistance measurements.
• Use 4-wire resistance measurements for best accuracy.
AC voltage and AC current:
• Select 6-1/2 digits, 10 PLC, filter ON (up to 100 readings), fixed range.
Temperature:
• Select 6-1/2 digits, 10 PLC, filter ON (up to 100 readings).
dBm 20
10.036mV
10V
-------------------------log 59.96879dB–==
dBm 20
9.964mV
10V
----------------------log 60.03133dB–==

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