問題：
What are my upgrade or replacement options for a Model 485?
答案：
Product(s) :Picoammeter: 485
Question : What are my upgrade or replacement options for a Model 485?
Answer: The Model 6485 Picoammeter is an excellent upgrade choice. Below is a comparison table:
Model 485 Model 6485 Measurement ranges
2nA - 2mA
2nA - 20mA
Voltage Burden
200 uV
200uV (1mV on 20mA range)
Reading Rate
3/sec
Up to 1000/sec
Digits
4.5
5.5
Analog Output
Yes
Yes
Battery Option
Yes
No
Buffer Size
100 samples
2500 samples
CE mark
only without GPIB
Yes
Input Connector
female BNC
female BNC
Additionally, the 6485 has both RS-232 and GPIB interfaces. It also supports both SCPI and a 485 emulation mode for bus control.
©Copyright 2003, Keithley Instruments, Inc.
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