Keithley 6487 Reference Manual

Model 6487 Reference Manual Range, Units, Digits, Rate, and Filters 4-11
Response time
The various filter parameters have the following effects on the time needed to display,
store, or output a filtered reading:
• Number of reading conversions — Speed and noise are tradeoffs.
Operation consideration
The digital filter operation will reset (start over) whenever the zero check operation is per-
formed or the range is changed.
Digital filter control
To configure the average filter:
1. Press CONFIG then FILT.
2. Set the display to AVERAGE ON, then press ENTER. The present number of read-
ing conversions to average (filter count) will be displayed (flashing).
3. Set filter count (2 to 100):
• Use the RANGE and or
 keys to display the desired filter count value at the
RDGS prompt.
• Press ENTER to set.
4. Set filter type (REPEAT or MOVING AV):
• Use the RANGE keys to display the desired filter type at the TYPE: prompt.
• Press ENTER to set.

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%