Keithley 7001 User Manual

Front Panel Operation
4-45
In the low state (0V), the output transistor sinks current
through the external device. In the high state, the out-
put transistor is off (transistor switch is open). This in-
terrupts current flow through the external device. Most
applications use active-low (ON=0V) LOGIC-SENSE.
Use the LOGIC-SENSE menu to check or change the
sense of each digital output line (refer to OUTPUT-PO-
LARITY in paragraph 4.6.3).
Outputs used as logic inputs
To use the digital outputs as logic inputs to active TTL,
Low-power TTL, or CMOS inputs:
1. Connect the Model 7001 digital outputs to the logic
inputs.
2. Connect the digital grounds.
3. Using the OUTPUT-STATUS menu, check the set-
ting of the Model 7001 output lines. The OUTPUT-
STATUS value for each output used should be ON.
4. Using the OUTPUT-POLARITY menu, check the
logic-sense setting of the Model 7001 output lines
(TTL1 through TTL4). Make sure the correct LOGIC-
SENSE value is selected for each output line. The
LOGIC-SENSE value varies according to the type of
TTL, Low-power TTL, or CMOS inputs used (AC-
TIVE-HIGH or ACTIVE-LOW).
When low (0V), the output sink can drive at least 10
standard TTL inputs. When high (+5V), the 10kΩ pull-
up resistor will source >100µA while remaining at
>3.75V output (a reliable logic high).
CAUTION
Do not apply more than 100mA max-
imum current or exceed +30V maxi-
mum voltage on pin 3 of J1007 (the
digital I/O port). Applying current or
voltage exceeding these limits may
damage the instrument.
An externally powered relay connected to the digital
output port is shown in Figure 4-10. Other externally
powered devices can be similarly connected by re-
placing the relay with the device. When using the
Model 7001’s collector outputs to turn on externally
powered devices, set the correspinding digital output
line parameters as follows (set through the MAIN
MENU > DIGITAL-I/O > OUTPUT-STATUS and
OUTPUT-POLARITY menus):
OUTPUT-STATUS=ON
TTLX LOGIC-SENSE=ACTIVE-LOW
NOTE
The X in TTLX represents the digital
output line number (TTL1 through
TTL4). This parameter is set through
the OUTPUT-POLARITY menu by se-
lecting the desired digital output line
number and pressing Enter.
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Keithley 7001 Specifications

General

Max Switching Voltage	300 V
Max Switching Current	1 A
Operating Temperature	0°C to 50°C
Switching Speed	1 ms
Interface	GPIB, RS-232
Switching Type	Various, depending on installed switch cards (e.g., electromechanical, solid-state)

Summary

Warranty

Limitation of Warranty

Limits of warranty coverage, remedies, and exclusions.

Safety Precautions

7001 High Density Switch System Specifications

SYSTEM

Core system parameters including capacity, memory, timing, triggers, and I/O.

ANALOG BACKPLANE

Details on analog backplane signals, voltage, current, and isolation.

IEEE-488 BUS IMPLEMENTATION

GENERAL

1 General Information

1.3 Warranty Information

Details and procedures related to product warranty.

1.5 Safety Symbols and Terms

Explanation of safety symbols and terms used throughout the manual.

1.6 Specifications

Technical specifications of the Model 7001 instrument.

2 Card Installation

2.2 Model 701X Series Card Installation

Steps for installing 701X series cards into the mainframe.

2.3 Non-701X Series Cards

Steps for installing non-701X series cards into the mainframe.

4 Front Panel Operation

4.2 Power-up Procedure

Steps for connecting power and starting the instrument.

4.5 Mainframe Programming

4.7 Card Config

4.8 Scan Config

5 IEEE-488 Reference

5.2 IEEE-488 Bus Connections

5.3 Primary Address Selection

5.6 Status Structure

7 Maintenance

7.2 Service Options

7.3 Static-Sensitive Devices

Precautions for handling static-sensitive components.

7.5 Disassembly

Procedures for removing instrument covers and boards.

7.6 Diagnostics

How to run the instrument's built-in diagnostic tests.

7.8 Troubleshooting

Guidance for diagnosing and fixing instrument malfunctions.

8 Replaceable Parts

8.2 Electrical Components List

8.4 Ordering Information

8.5 How to Obtain Factory Service

Process for returning the instrument for factory service.

6 Theory of Operation

6.2 Overall Functional Description

General functional overview of the Model 7001.

6.3 Control Function

Description of the instrument's internal control mechanisms.

6.4 Relay Control Circuitry