Keithley 2701 Service Manual

Model 2701 Service Manual Troubleshooting 4-9
RS-232 interface
Serial data transmission and reception is performed by the TXD and RXD lines of the MPU.
U15 provides the necessary voltage level conversion for the RS-232 interface port.
Trigger circuits
Buffering for Trigger Link input and output is performed by U14 and U20. Trigger input and
output is controlled by FPGA U9 under MPU supervision.
Digital I/O
U23 and U24 make up the digital input/output. Digital I/O is controlled by the FPGA U9
under MPU supervision.
Module slot control
U13 and U21 make up the control circuitry that allows communication of relay data to
Slot 1 or Slot 2.
Ethernet interface
U10 is a NET+ARM 32-bit RISC processor that supervises Ethernet port operation. This IC
includes an integrated 10/100BaseT MAC as well as numerous other features such as two serial
ports, DMA controller, and general-purpose I/O lines. U1 is the ARM processor memory IC,
while U12 provides Ethernet port I/O buffering and drive capabilities.

Keithley 2701 Specifications

General

Max Voltage	300 V
Max Current	3 A
Frequency Range	3 Hz to 500 kHz
Frequency Accuracy	0.01%
Weight	3.6 kg
Measurement Functions	Frequency, Temperature
Interface	IEEE-488 (GPIB), RS-232
DC Voltage Range	300 V
DC Current Range	3 A
AC Voltage Range	300V
AC Current Range	1 μA to 3 A
Resistance Accuracy	0.01%
Channels	10
Dimensions	213mm x 88mm x 370mm