The manual for the Rohde & Schwarz Triple DC Power Supplies covers the setup, operation, and troubleshooting of the NGT 20, NGT 25, and NGT 35 models, including instructions for connecting to the local AC supply, adjusting voltage and current settings, and utilizing features such as overvoltage protection and tracking operation. It also provides detailed guidance on calibration, maintenance, and circuit details to ensure effective and error-free use of the power supplies.
Manual Overview
The service manual for the Rohde & Schwarz Triple DC Power Supplies NGT series provides comprehensive guidance on troubleshooting, diagnostics, calibration, and board-level adjustments. The manual outlines a systematic troubleshooting flow, emphasizing the identification and resolution of common issues through error codes and diagnostics. Calibration procedures are detailed for output voltage, current, and tracking operation, ensuring precise adjustments using ten-turn potentiometers for voltage and one-turn potentiometers for current. The manual includes board-level guidance, with circuit diagrams and a components plan for the regulator board, aiding in detailed component-level troubleshooting and repairs. Error codes and diagnostics are integral for identifying issues related to overvoltage protection and current limiting, with specific sections dedicated to these features. The manual also covers the operation of the power supplies, including series, parallel, and tracking modes, and provides detailed specifications for each channel, ensuring technicians can effectively manage and maintain the equipment.
Quick Issues Covered
- Diagnose overvoltage protection issues on channel C.
- Calibrate output voltage and current for accurate readings.
- Trace circuit diagrams for regulator board troubleshooting.
Overview
The Rohde & Schwarz Triple DC Power Supplies, models NGT 20, NGT 25, and NGT 35, are designed as constant-voltage sources with current limiting capabilities, and can also function as constant-current sources for less stringent requirements. These power supplies feature separate operation, series or parallel connection of the three voltage sources, and tracking operation for channels A and B. They include overvoltage protection for the 6-V output (channel C), high-resolution voltage setting with a ten-turn potentiometer, and short-circuit protection. Each output has a switchable meter for voltage or current, and the outputs are floating with test voltages up to 1000 V to earth. The manual covers the general features, specifications, preparation for use, operation, adjustment, and maintenance of the power supplies.
Specifications
- Output voltage adjustable by ten-turn potentiometer: <10 mV…35 V, <10 mV…25 V, <10 mV…20 V, <10 mV…6 V
- Resolution: <0.02 %
- Response threshold of overvoltage protection (preset): 4.5…10 V
- Current limiting adjustable by one-turn potentiometer: <10 mA…0.6 A, <10 mA…0.8 A, <10 mA…1 A, <10 mA…5 A
- Resolution: <1 %
- Deviation of output voltage at an AC supply voltage variation of ±10 %: <0.01 %
- Deviation of output voltage at temperature variations between -10…+40 °C: <0.01 %/°C
- Deviation of output voltage at load variations from 10 to 90 %: <0.006 %, <0.008 %, <0.01 %, <0.09 %
- Ripple and noise: <0.25 mV Vrms, <0.2 mV Vrms, <0.15 mV Vrms, <0.2 mV Vrms
- Transient recovery time following a sudden change from no load to full load: <75 µs
- Deviation of output current at an AC supply voltage variation of ±10 %: <0.2 %
- Deviation of output current at temperature variations between -10…+40 °C: <0.01 %/°C
- Deviation of output current at load variations from 10 to 90 %: <0.4 %, <0.35 %, <0.25 %, <0.3 %
- Operating temperature: -10…+40 °C
- Meter error: 2.5% of f.s.d.
- Output terminals: floating, test voltage 1000 V to earth
- Panel engravings: German + English
- AC supply: 110/220 V ±10%, 50 – 60 Hz
- Power consumption: 200 VA
- Dimensions (W x H x D), weight: 190 mm x 172 mm x 278 mm, 7 kg
- Order designation NGT 20: 117.7133.02
- Order designation NGT 35: 191.2019.02
- Order designation NGT 25: 192.0503.02
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The set is factory-adjusted for operation from a 220 V AC supply. To adapt it to 110 V, the position of the voltage selector on the rear panel must be changed and 4-A fuses inserted. The set connects to the local AC supply via a patch cord with a plug that has an earthing contact. When switched on, the lamp in the power switch on the front panel lights up.
Operation
The operation of the Triple DC Power Supplies involves using the left-hand ten-turn potentiometers for voltage adjustment and the right-hand ones for current adjustment. The toggle switches marked “INSTRUMENT” allow for the selection of voltage (V) or current (A) indication. Loads should be connected to the floating terminals marked with + and -. The sockets marked with the earth symbol are connected to the chassis and the non-fused earth conductor. A green lamp above the current potentiometer indicates when the channel operates with current limiting.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 548.8 KB)
Rohde-Schwarz NGT 20/25/35 Manual: Aids in troubleshooting, calibration, and servicing of NGT series equipment. PDF size: 548.8 KB.
- Brand: Rohde-schwarz-ngt-20-25-35-operation-service
- Model: MANUAL
- Type: Service manual
- File size: 548.8 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download MANUAL service manual (PDF)
Overview of Rohde-schwarz-ngt-20-25-35-operation-service
The Rohde-schwarz-ngt-20-25-35-operation-service device is a versatile and reliable piece of technical equipment designed for precision measurement and signal analysis. It is widely used in telecommunications, electronics testing, and research laboratories to ensure accurate diagnostics and efficient operation. This model series offers advanced features tailored for professionals requiring high performance and durability in their testing instruments.
Main Features and Specifications
- Frequency range coverage suitable for various signal types
- High-resolution display for clear data visualization
- Multi-mode operation supporting both analog and digital signals
- Robust build quality ensuring long-term durability
- Compact and lightweight design for easy portability
- Integrated data logging and export capabilities
- Advanced filtering and noise reduction functions
- Comprehensive connectivity options including USB and LAN
Basic Usage and Operation Tips
To operate the Rohde-schwarz-ngt-20-25-35 device efficiently, start by powering on the unit and allowing it to complete its self-diagnostic check. Select the appropriate measurement mode based on the signal type you intend to analyze. Use the intuitive control panel to adjust frequency ranges and sensitivity settings. Always calibrate the device before beginning any critical measurements to ensure accuracy. Refer to the display prompts for guidance on setting parameters and saving your data.
Troubleshooting and Maintenance
If the device fails to power on, check the power supply and connections first. For inconsistent readings, verify calibration and inspect cables for damage. Regularly clean the device’s exterior with a soft, dry cloth and avoid exposure to moisture or extreme temperatures. Periodically update the firmware to benefit from the latest enhancements and bug fixes. If issues persist, consult the detailed troubleshooting section in the manual or contact authorized service centers.
Safety Reminder
Always follow standard electrical safety procedures when operating the Rohde-schwarz-ngt-20-25-35 device. Avoid using the equipment in wet or explosive environments. Disconnect the device from power sources before performing any maintenance or cleaning. Use only approved accessories and replacement parts to prevent damage or injury. Proper handling and adherence to safety guidelines will ensure safe and effective operation.