1. Introduction
This manual provides essential information for the safe and effective use of the Keithley Model 196 6.5-digit System Digital Multimeter (DMM). The Keithley 196 is a high-precision instrument designed for various electrical measurements, offering a 6.5-digit display for accurate readings. Please read this manual thoroughly before operating the device.
Note: This product is a used unit, confirmed to be in working condition.
2. Safety Information
WARNING:
- To prevent electric shock, do not perform internal operator service unless you are qualified personnel.
- Only qualified service personnel should perform internal adjustments or maintenance.
- Always disconnect line power before servicing or replacing the line fuse.
- For continued protection against fire hazard, replace fuses only with the same type and rating as specified.
3. Setup and Connections
3.1 Unpacking and Inspection
Upon receiving your Keithley 196 DMM, carefully inspect the packaging and the instrument for any signs of damage. Report any damage to the shipping carrier immediately.
3.2 Front Panel Overview
The front panel features the 6.5-digit display, various function buttons (DCV, ACV, Ohms, Amps), range selection (AUTO/MANUAL), control buttons (ENTER, PROM, ZERO, FILTER, dB), and input terminals (VOLTS OHMS HI/LO, AMPS HI/LO).
3.3 Rear Panel Overview and Power Connection
- Line Voltage Selection: Before connecting power, ensure the LINE VOLTAGE SELECTED switch on the rear panel is set to match your local AC power supply (e.g., 90-110V or 180-220V). Incorrect selection can damage the instrument.
- Power Inlet: Connect the provided power cord to the AC power inlet on the rear panel and then to a grounded AC power outlet.
- Line Fuse: The instrument is protected by a line fuse, located near the power inlet. Ensure it is correctly rated for your selected line voltage.
- External Trigger/Remote/Output: These connectors are for advanced control and data output. Refer to the full service manual for detailed usage.
3.4 Input Connections
Connect your test leads to the appropriate input terminals on the front panel based on the measurement you intend to perform:
- Voltage (DCV/ACV) and Resistance (Ohms): Use the 'VOLTS OHMS HI' and 'LO' terminals.
- Current (Amps): Use the 'AMPS HI' and 'LO' terminals. Ensure the correct current range is selected to avoid damaging the instrument.
4. Operating Instructions
4.1 Power On/Off
Press the 'POWER' switch on the front panel to turn the instrument ON or OFF.
4.2 Basic Measurements
- Select Function: Press the desired function button (e.g., DCV, ACV, OHMS, AMPS) to select the measurement mode.
- Select Range: The instrument supports 'Auto Range' operation. Press the 'AUTO' button for automatic range selection, or manually select a range using the 'RANGE' buttons if precise control is needed.
- Connect Probes: Connect your test probes to the circuit under test, ensuring proper polarity for DC measurements.
- Read Display: The measurement will be shown on the 6.5-digit display.
4.3 Advanced Functions
- ZERO: Use the 'ZERO' button to null out residual offsets or lead resistance for more accurate measurements.
- FILTER: The 'FILTER' function can be used to smooth out noisy readings.
- dB: The 'dB' function allows for measurements in decibels.
- CONTROL/ENTER/PROM/MODIFIER: These buttons are used for programming and accessing advanced features. Consult the full Keithley 196 user manual for detailed programming instructions.
5. Maintenance
5.1 Cleaning
Clean the exterior of the instrument with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the instrument is powered off and disconnected from the AC supply before cleaning.
5.2 Fuse Replacement
If the instrument fails to power on, the line fuse may need replacement. Refer to the rear panel (Figure 2) for the fuse location. Always replace the fuse with one of the identical type and rating as specified on the instrument's rear panel.
5.3 Calibration
The instrument has a calibration seal. The message "CALIBRATION VOID IF SEAL DAMAGED" indicates that breaking this seal will void any existing calibration. For professional calibration, contact qualified service personnel.
6. Troubleshooting
- No Power: Check the power cord connection, the line voltage selection switch on the rear panel, and the line fuse.
- Incorrect Readings: Verify probe connections, ensure the correct function and range are selected, and check for proper grounding.
- Noisy Readings: Try enabling the 'FILTER' function. Ensure proper shielding of test leads in high-noise environments.
- Display Issues: If the display is blank or erratic, power cycle the instrument. If the problem persists, contact support.
7. Specifications
| Feature | Specification |
|---|---|
| Model | Keithley 196 |
| Display | 6.5-digit |
| Operating Mode | Auto Range |
| DIY Supplies | Electrical |
| Condition | Used, but can work normally |
| Battery Included | No |
| Package Length | 50 cm |
| Package Width | 40 cm |
| Package Height | 30 cm |
| Package Weight | 3.0 kg |
8. Warranty and Support
This Keithley 196 DMM is a used instrument and is sold in working condition. For any technical inquiries or support, please contact the seller:
- Seller: Fuhua_Instrument Store
- Email: fuhuatest@yeah.net
- WhatsApp: +86 13632659106
Please note that due to the used nature of the product, specific warranty terms may vary. It is recommended to clarify any warranty details directly with the seller.