Keithley 428 Amplifier
Manufacturer:
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.

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Service Manual
Manual type:
Service Manual
Pages:
23
Size:
707.53 Kbytes (724514 Bytes)
Language:
english
Revision:
A
Manual ID:
428-903-01
Date:
01 January 1990
Quality:
Scanned document, all readable.
Upload date:
23 August 2018
MD5:
529622f716f7a31bb9cc53155b7b361d
Downloads:
282

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.

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User Manual
Manual type:
User Manual
Pages:
211
Size:
7.12 Mbytes (7464385 Bytes)
Language:
english
Revision:
D
Manual ID:
428-901-01
Date:
01 February 1999
Quality:
Scanned document, all readable.
Upload date:
23 August 2018
MD5:
b334e4e229d4a70b942e7a95cbd5f5d3
Downloads:
394

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

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