Keithley 6487 User Manual

Model 6485 and 6487 User’s Manual Getting Started 1-19
Power-up
Line power connection
Follow the procedure below to connect the Model 6485/6487 to line power and turn on the
instrument.
1. Check to see that the line voltage indicated in
the window of the fuse holder assem-
bly (Figure 1-2 or Figure 1-4) is correct for the operating vo
ltage in your area. If
not, refer to the procedure in Section 17 of t
he Model 6485 Instruction Manual or
Model 6487 Reference Manual for setting line voltage and fuse replacement.
CAUTION Operating the instrument on an incorrect line
voltage may cause dam-
age to the instrument, possibly voiding the warranty.
2. Before plugging in the power cord, make sure that the front panel power switch is
in
the off (O) position.
3. Connect the female end of the supplied power cord to
the AC receptacle on the rear
panel. Connect the other end of the power cord to a grounded AC outlet.
WARNING The power
cord supplied with the Model 6485/6487 contains a sepa-
rate ground terminal for use with grounded outlets.
When proper con-
nections are made, instrument chassis is connected to power line
ground
through the ground wire in the power cord. Failure to use a
grounded outlet may result in personal injury or death due to electric
shock.
4. Turn on the instrument by pressing the front panel power switch to the on (I)
posi-
tion.
Line frequency
The Model 6485/6487 operates at line frequencies of 50 or 60Hz. When auto detect is
enabled (factory default), line frequencies are automatically sensed and set accordingly,
therefore there are no switches to set. Use the :SYST:LFR? command (query) to read the
line frequency. The factory default setting is auto detect enabled.
If the power line is noisy, auto detect may not be
able to lock in on a frequency. If this
occurs, set the frequency manually. This may be accomplished using the front panel or
over the bus. From the front panel, use the MENU/LFREQ selection to change the fre-
quency. Via remote, send the SYST:LFR <freq> command.

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%