Keithley 428 Amplifier
Manufacturer:
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Model:
428
Date:
1990
Category:
Group:
Description:
Current Amplifier
Information
FEATURES
The model 428 Current Amplifier provides current-to-voltage
conversion on eight ranges between 10³V/A and 10¹⁰V/A
(10¹¹V/A with X1O gain enabled). Very fast response time
allows the unit to be used in difficult applications such as
in measuring very small, transient currents.
Key model 428 features include:
• Enhanced current suppression: multiple current suppression
ranges between ±5nA and ±5mA allow a wide range of
steady-state currents to be suppressed. An automatic
suppression feature simplifies the current suppression process.
• Programmable bias voltage: allows a fixed DC bias voltage
from ±2.5mV to ±5V to be applied to the device connected to
the input of the model 428.
• Fast response time: 2µsec rise time (10-90%) at 10³ and
10⁴ V/A gain (and 10⁵V/A with xlO gain enabled) for fast
current to voltage conversion.
• Programmable rise time Filter The rise time of the Filter
can be programmed for values between 10µsec and 300msec.
• Zero check: opens the input thus zeroing the output for
easy checking of instrument offsets. Zero correct will
automatically zero the input amplifier's voltage offset, to
typically <50µV of offset
• Ease of use: simplified front panel design and versatile
firmware for easy front panel setup and use.
• IEEE-488 Interface (Model428-PROG only): allows the unit
to be programmed and controlled from a computer for
automated instrument operation.
• Adjustable display intensity: normal/dim/off display modes
for low-light or photosensitive applications.
Manual type:
Service Manual
Pages:
23
Size:
707.53 Kbytes (724514 Bytes)
Language:
english
Revision:
A
Manual ID:
428-903-01
Date:
1990 01 01
Quality:
Scanned document, all readable.
Upload date:
2018 08 23
MD5:
529622f716f7a31bb9cc53155b7b361d
Downloads:
478
Information
Quick Reference Guide
This Quick Reference Guide includes information on front
panel operation for both the Model 428-MAN and the Model
428-PROG, as well as IEEE-488 operation information for the
Model 428-PROG.
Manual type:
User Manual
Pages:
211
Size:
7.12 Mbytes (7464385 Bytes)
Language:
english
Revision:
D
Manual ID:
428-901-01
Date:
1999 02 01
Quality:
Scanned document, all readable.
Upload date:
2018 08 23
MD5:
b334e4e229d4a70b942e7a95cbd5f5d3
Downloads:
603
Information
Contains information on model 428 features,
specifications, and Accessories. SECTION 1
General Information
Covers introductory information on using the model 428 from
the front panel and over the IEEE-488 bus (Model 428-PROG
only). SECTION 2 Getting Started
Supplies in-depth information about using the Model428 from
the front panel SECTION 3 Front Panel Operation
Details IEEE-488 information, including general commands and
device-dependent commands. Section 4 applies only to the
Model 428-PROG. SECTION 4 IEEE-488 Reference
Outlines the verification procedures for checking
current-to-voltage conversion accuracy and the functionality
of the suppress and voltage bias circuits. SECTION 5
Performance Verification
Gives a detailed discussion of the various circuits within
the instrument SECTION 6
Theory of Operation
Covers such important service information as fuse
replacement, adjustments, and troubleshooting. SECTION 7
Service Information
Lists replacement parts and covers how to obtain parts.
SECTION 8 Replaceable Parts