Keithley 2400 Service Manual

2400-902-01 (G - Feb 2006)
Model 2400 Service Manual 5-4
Disassembly
Case cover removal
Follow the steps below to remove the case cover to gain access to internal parts.
WARNING Before removing the case cover, disconnect the line cord and any test leads
from the instrument.
1. Remove Handle — The handle serves as an adjustable tilt-bail. Adjust its position by
gently pulling it away from the sides of the instrument case and swinging it up or down.
To remove the handle, swing the handle below the bottom surface of the case and back
until the orientation arrows on the handles line up with the orientation arrows on the
mounting ears. With the arrows lined up, pull the ends of the handle away from the
case.
2. Remove Mounting Ears — Remove the screw that secures each mounting ear. Pull
down and out on each mounting ear.
NOTE When reinstalling the mounting ears, be sure to mount the right ear to the right side
of the chassis and the left ear to the left side of the chassis. Each ear is marked
“RIGHT” or “LEFT” on its inside surface.
3. Remove Rear Bezel — To remove the rear bezel, loosen the two screws that secure the
rear bezel to the chassis, and then pull the bezel away from the case.
4. Removing Grounding Screws — Remove the two grounding screws that secure the
case to the chassis. They are located on the bottom of the case at the back.
5. Remove Chassis — To remove the case, grasp the front bezel of the instrument, and
carefully slide the chassis forward. Slide the chassis out of the metal case.
NOTE To gain access to the components under the analog board shield, remove the shield,
which is secured to the analog board by a single screw.
Analog board removal
Perform the following steps to remove the analog board. This procedure assumes that the case
cover is already removed.
1. Remove analog board shield.
Remove the screw that secures the shield to the analog board, then remove the shield.
2. Disconnect the front and rear input terminals.
You must disconnect these input terminal connections for both the front and rear inputs:
• INPUT/OUTPUT HI and LO
• 4-WIRE SENSE HI and LO
•V, Ω, GUARD, and GUARD SENSE (rear panel only)

Keithley 2400 Specifications

General

Model	2400
Category	SourceMeter
Voltage Source Range	±200 V
Power Output	20 W
Voltage Measurement Resolution	100 nV
Current Measurement Resolution	10 pA
Resolution	5.5 digits
Interfaces	GPIB, RS-232
Current Source Range	±1A
Current Measurement Range	±1A
Resistance Measurement Range	2 Ω to 200 MΩ
Display	Vacuum Fluorescent Display