Keithley 6512, Instruction Manual

Page: 27 / 156

Operation
2-7
IEEE COMMON
TRIAX
250V PEAK
SLOWBLOW
1/8A 90-125V
1/16A 180-250V
LINE RATING
50-60 HZ
15VA MAX
2V
ANALOG OUTPUT
LINE
FUSE
LINE VOLTAGE
SELECTED
(INTERNAL)
105-125V
210-250V
IEEE 488 INTERFACE
ADDRESS ENTERED WITH
FRONT PANEL PROGRAM
INPUT
INPUT
OFF
500V
PEAK
PREAMP
ON
GUARD
(FOLLOWS
INPUT) V,
Ω
GUARD
LO
10K
PREAMP OUT
100
2V ANALOG OUTPUT
CAUTION:
DO NOT FLOAT INPUT LO
WITH PREAMP OUT COM
CONNECTED TO EARTH.
COM
!
!
!
COM
PREAMP OUT
METER
COMPLETE
OUTPUT
EXTERNAL
TRIGGER
INPUT
SH1 AH1 T5 TE0 L4 LE0 SR1 RL0 PP0 DC1 C0 E1
OFF
ON
V,
Ω
GUARD
!
6
7
8
1
2 3 4
5
9
10 11
Figure 2-2
Model 6512 rear panel
3 IEEE-488 Connector
This connector is used to connect the instrument to the IEEE-
488 bus. IEEE-488 function codes are marked above the con-
nector.
4 LINE FUSE
The LINE FUSE, which is accessible on the rear panel, pro-
vides protection for the AC power line output. For informa-
tion on replacing this fuse, refer to Section 7.
5 AC Receptacle
Power is applied through the supplied power cord to the AC
receptacle. Note that the supply voltage is marked adjacent
to the receptacle.
6 Chassis Ground
This jack is a 5-way binding post that is connected to instru-
ment chassis ground. It is intended for use in situations re-
quiring an accessible chassis ground terminal. A shorting
link is supplied and connected between the chassis ground
and COM terminals.
1 INPUT
The INPUT connector is a 3-lug female triax connector to be
used for all electrometer signal inputs. Note that you should
not confuse a triaxial connector with the BNC type that is
used for the EXTERNAL TRIGGER and ELECTROME-
TER COMPLETE connections. Also, do not attempt to force
2-lug triaxial connector onto the INPUT connector. (See
paragraph 1.9 for details on 2-lug to 3-slot triax adapters.)
CAUTION
Do not float INPUT LO with preamp
out COM connected to earth (chassis
ground).
2 V,
Ω
GUARD Switch
The V,
Ω
GUARD switch adds capabilities for connecting a
guard voltage to the inner shield of the input cable. Guarding
is useful in the volts and ohms modes to speed up response
time and minimize the effects of leakage resistance and stray
capacitance. Note that guarded operation is not recommend-
ed in amps or coulombs modes. See paragraph 2.7.4 for more
information on guarded operation.