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Keithley Manuals
Measuring Instruments
2500
User manual
Keithley 2500 User Manual
Photodiode meter
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Service manual
(121 pages)
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
1 Getting Started
General Information
Warranty Information
Contact Information
Manual Addenda
Safety Symbols and Terms
Getting Started
Inspection
Options and Accessories
Manuals
Triax Cables and Adapters
Carrying Case
Interface Cables
Rack Mount Kits
Product Overview
Front and Rear Panel Familiarization
Front Panel Summary
Rear Panel Summary
Figure 1-3 Model 2502 Rear Panel
Power-Up
Line Voltage Selection
Line Power Connection
Power-Up Sequence
System Identification
Line Frequency Setting
Front Panel Line Frequency
Remote Command Line Frequency
Fuse Replacement
Display
Display Format
Table 1-1 Line Fuses
CHANNEL SELECT Key
DISPLAY TOGGLE Key
Status and Error Messages
Disabling Front Panel Display
Front Panel Control
Remote Display Programming
Front Panel Tests
Default Settings
Saving and Restoring User Setups
Restoring Setups
Saving Setups
Power-On Configuration
Factory Default Settings
Table 1-3 Factory Default Settings
Remote Setups
Menus
Main Menu
Table 1-4 Main Menu
Figure 1-4 Main Menu Tree
Rules to Navigate Menus
Editing Voltage Bias Values
Configuration Menus
Table 1-5 Measurement Configuration Menus
Table 1-6 Source Configuration Menus
Table 1-8 Limit Configuration Menu
Table 1-9 Trigger Configuration Menu
Table 1-10 Sweep, Digits, Speed, and Data Store Configuration Menus
Table 1-11 Output and Display Configuration Menus
2 Connections
Connection Precautions
INPUT and OUTPUT Connectors
Connector Terminals
Triax INPUT Connectors
OUTPUT Connectors
Output Enable
Photodiode Connections
Typical Connections
Figure 2-3 Typical Photodiode Connections
Equivalent Circuit
Connection Considerations
Ground Connect Mode Connections
Figure 2-6 Ground Connect Mode Equivalent Circuit
Alternate Connecting Methods
Current Measurement Connections
Voltage Source Connections
Analog Output Connections (Model 2502 Only)
Analog Output Connector Terminals
Non-Isolated Connections
Isolated Connections
Equivalent Circuits
Figure 2-13 Analog Output Equivalent Circuit with Ground Connect Enabled
3 Basic Operation
Operation Overview
Measurement and Voltage Bias Capabilities
Ranges
Compliance
Basic Circuit Configuration
Operation Considerations
Warm-Up
Auto Zero
Front Panel Auto Zero
Remote Command Auto Zero
Source Delay
Auto Delay Period
Table 3-3 Auto Source Delay
Manual Delay
Output Slew Time
Front Panel Source Delay
Remote Command Source Delay
Ground Connect Mode
Front Panel Ground Connect
Remote Command Ground Connect
Figure 3-3 Ground Connect Enabled
Basic Measurement Procedure
Output Control
Basic Measurement Circuit Configuration
Front Panel Measurement Procedure
Step 1. Select Measurement Channel and Range
Step 2. Select Source Channel and Set Source Level
Step 3. Turn Source Outputs on
Step 4. Observe Readings on the Display
Step 5. Turn Source Output off
Remote Command Measurement Procedure
Basic Measurement and Voltage Source Commands
Measurement Programming Example
Table 3-6 Basic Measurement and Voltage Source Commands
Using the Analog Outputs (Model 2502 Only)
Table 3-7 Basic Measurement Command Sequence
4 Photodiode Measurements
Configuring Measurements
Measurement Configuration Menu
Configuring Measurements
Optical Power
Front Panel Photodiode Measurements
Photodiode Measurement Circuit Configuration
Front Panel Photodiode Measurement Procedure
Step 1. Configure Measurement Functions
Step 2. Set Bias Voltage Source Values
Step 3. Turn Source Outputs on
Step 4. Observe Readings on the Display
Step 5. Turn Source Outputs off
Remote Photodiode Measurements
Photodiode Measurement Commands
Table 4-2 Photodiode Measurement Commands
Photodiode Measurement Programming Example
Table 4-3 Basic Measurement Command Sequence
5 Measurement Concepts
Source-Delay-Measure Cycle
Overview
Triggering
Delay Phase
Measurement Time
Sweep Waveforms
Staircase Sweeps
Custom Sweep
SDM Cycle During Sweeps
Typical Sweep Applications
Sweep Data Storage
Bias Source Operating Boundaries
Limit Lines
Loading Effects
Figure 5-5 Loading Effects
Data Flow
Basic Readings
Data Storage Enabled
Limit Test Enabled
Figure 5-6 Data Flow Front Panel
Figure 5-7 CALC Block Data Flow
6 Range, Digits, Speed, and Filters
Range and Digits
Measurement Range
Available Ranges
Manual Ranging
Maximum Readings
Auto Range Limits
Auto Range Operation with Range Limits
Auto Ranging
Digits
Setting Display Resolution
Remote Range and Digits Programming
Range and Digits Programming Example
Speed
Setting Speed
Speed-Accuracy Menu
Remote Speed Programming
Speed Commands
Speed Programming Example
Filters
Filter Stages
Figure 6-2 2-Stage Filtering
Table 6-4 Speed Commands
Figure 6-3 Repeat Filter (Count 10)
Median Filter
Repeat Filter
Figure 6-4 Median Filter (Rank 5)
Figure 6-5 Moving Filter (Count 10)
Moving Filter
Filter Configuration
Filter Control
Remote Filter Programming
Filter Commands
Table 6-6 Filter Commands
Filter Programming Example
7 Relative, Math, Ratio, and Delta
Relative
Front Panel Rel
Defining a Rel Value
Enabling and Disabling Rel
Using REL in the Dual-Channel Mode
Remote Rel Programming
Rel Commands
Table 7-1 Rel Commands
Rel Programming Example
Measurement Math Functions
Math Functions
I/V
Electrical Power
MX + B
Optical Power
Front Panel Math Functions
Remote Math Functions
Math Function Programming Example
RATIO and DELTA
RATIO Functions
Msr1/Msr2
Table 7-5 Math Function Programming Example
Msr2/Msr1
DELTA Functions
Msr1-Msr2
Front Panel RATIO and DELTA Configuration
Table 7-6 RATIO and DELTA Configuration Menus
Remote RATIO and DELTA
RATIO and DELTA Function Programming Example
8 Data Store
Data Store Overview
Front Panel Data Store
Storing Readings
Recalling Readings
Buffer Location Number
Displaying Other Buffer Readings
Timestamp
Buffer Statistics
Average
Minimum and Maximum
Peak-To-Peak
Standard Deviation
Timestamp Format
Timestamp Accuracy
Buffer Considerations
Using :Trace Commands to Store Data
Using :READ? to Store Data
Remote Command Data Store
Data Store Commands
Table 8-1 Data Store Commands
Data Store Programming Example
Table 8-2 Data Store Example
9 Sweep Operation
Sweep Types
Linear Staircase Sweep
Logarithmic Staircase Sweep
Figure 9-2 Logarithmic Staircase Sweep (Example 5-Point Sweep from 1 to 10 Volts)
Custom Sweep
Table 9-1 Logarithmic Sweep Points
Custom Sweep Examples
Figure 9-3 Custom Pulse Sweep
Figure 9-4 Custom Sweep with Different Pulse Widths
Configuring and Running a Sweep
Front Panel Sweep Operation
Configuring a Sweep
Setting Delay
Trigger Count and Sweep Points
Performing Sweeps
Performing a Linear Staircase Sweep
Performing a Log Staircase Sweep
Performing a Custom Sweep
Remote Sweep Operation
Staircase Sweep Commands
Staircase Sweep Programming Example
Table 9-3 Staircase Sweep Programming Example (Photodiode Test)
Custom Sweep Commands
Table 9-4 Custom Sweep Commands
Custom Sweep Programming Example
10 Triggering
Trigger Model (Front Panel Operation)
Idle
Figure 10-1 Trigger Model (Front Panel Operation)
Event Detection
Arm Layer
Trigger Layer
Trigger Delay
Source, Delay, and Measure Actions
Counters
Output Triggers
Bench Defaults
Operation Summary
Trigger Link
Input Trigger Requirements
Figure 10-2 Rear Panel Pinout
Figure 10-3 Trigger Link Input Pulse Specifications
External Triggering Example
Figure 10-4 Trigger Link Output Pulse Specifications
Figure 10-5 DUT Test System
Figure 10-6 Trigger Link Connections
Model 2500 Setup
Operation
Switching Mainframe Setup
Figure 10-7 Operation Model for Triggering Example
Configuring Triggering
CONFIGURE TRIGGER Menu
Figure 10-8 Configure Trigger Menu Tree
Remote Triggering
Trigger Model (Remote Operation)
Idle and Initiate
Figure 10-9 Trigger Model (Remote Operation)
Event Detection
Arm Layer
Trigger Layer
Trigger Delay
Source, Delay, and Measure Actions
Figure 10-10 Measure Action
Counters
Output Triggers
GPIB Defaults
Operation Summary
Remote Trigger Commands
Remote Trigger Example
Table 10-2 Remote Triggering Example
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Quick Links
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Interface Cables
Download this manual
Models 2500 and 2502
User's Manual
A G R E A T E R M E A S U R E O F C O N F I D E N C E
Visit us at www.TestEquipmentDepot.com
Photodiode Meter
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
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