The Delta Electronics RF Ammeter (TCA) series offers AM broadcasters a reliable tool for measuring common point and antenna base currents. Utilizing a toroidal current transformer, the ammeter samples RF current and converts it into a DC voltage for accurate current display. The ammeter also includes relays for remote control and outputs for remote indications.
Description
The RF Ammeter system consists of three main components:
- Toroidal Current Transformer (TCT) Unit: Available in three models (TCT-N, TCT-N-HV, TCT-N-XHV), each designed for different conductor voltage ratings (10 kVRMS, 20 kVRMS, 42.4 kVRMS).
- Rectifier/Meter Unit: Converts the RF sample voltage to a DC voltage for meter display. It offers local meter control and dual-scale options.
- Interconnecting Coaxial Cable: Standard six-foot 50-ohm cable, with optional longer or double-shielded versions available.
Ammeter Models
Single Scale Models:
- Current Range (ARMS)
- 1-5 A: TCA-5-EXR
- 2-10 A: TCA-10-EXR
- 4-20 A: TCA-20-EXR
- 8-40 A: TCA-40-EXR
- 10-50 A: TCA-50-EXR
- 16-80 A: TCA-80-EXR
- 24-120 A: TCA-120-EXR
- 32-160 A: TCA-160-EXR
Dual Scale Models:
- Current Range (ARMS)
- 1-5 A and 2-10 A: TCA-5/10-EXR
- 1-5 A and 4-20 A: TCA-5/20-EXR
- 2-10 A and 4-20 A: TCA-10/20-EXR
- 2-10 A and 8-40 A: TCA-10/40-EXR
- 4-20 A and 8-40 A: TCA-20/40-EXR
- 8-40 A and 16-80 A: TCA-40/80-EXR
- 16-80 A and 32-160 A: TCA-80/160-EXR
High Voltage Models
- TCA-N-EXR-HV: Equipped with a high voltage transformer rated for 20 kVRMS.
- TCA-N-EXR-XHV: Features an extra high voltage transformer rated for 42.4 kVRMS.
Accuracy and Calibration
- Accuracy: ±2% full scale over -40°C to +65°C, and 500 kHz to 2000 kHz.
- Calibration: Factory calibrated at 1 MHz with a guaranteed accuracy of ±2% full scale, adjustable to ±1% using the linearity correction chart. Calibration is warranted for one year, excluding lightning damage.
Key Features
- Dual Scale Options: Allows selection of adjacent or specific nonadjacent scales (e.g., N/2N or N/4N).
- Remote Control and Monitoring: External outputs and internal relays facilitate remote metering and control.
- Lightning Protection: A built-in toggle switch grounds the rectifier circuit when not in use, protecting the system.
- Temperature Compensated Rectifier Circuit: Ensures stable readings across a wide temperature range.
- Standard and Optional Accessories: Including various remote meter sets, power supplies, mounting brackets, and shielded enclosures.
Specifications
- Frequency Range: 0.5 to 2 MHz
- Current Ranges: 1 to 160 Amperes
- Rectifier Circuit: Temperature compensated, linearized silicon rectifier
- Operating Temperature: -40°C to +65°C
- Transformer Voltage Ratings:
- TCT-N: 10 kVRMS
- TCT-N-HV: 20 kVRMS
- TCT-N-XHV: 42.4 kVRMS
- Electric Field Rejection: >100 dB
- Interconnecting Cables: 50 ohm, 6 feet (optional lengths available)
- Scale Characteristics: Linear scale with divisions compliant with FCC regulations.
Custom Options
Custom Meter Scales: Special full-scale current values (e.g., 8, 12, 50 Amperes) and secondary scales calibrated in Watts referenced to 50 Ohms are available.
Available Accessories:
- Remote Meter Sets
- Standard and Enclosed Meter Panels
- Integrating Buffer Amplifier Assembly
- Power Supplies
- Conductor Bushings
- Mounting Brackets
- Transient Suppressor Assemblies
- EMI/RFI Shielded Enclosures
The Delta Electronics RF Ammeter series is a versatile and precise tool for RF current measurement, providing robust features and customization options for broadcasters and other professionals in the field. Contact us for more information or to request a quote!
