RDL PT-ASG1 Datasheet

™

PT

SERIES

Model PT-ASG1
Audio Signal Generator

 Portable Audio Generator
 Selectable Mic or Line Level Output
 Precision Stable Output
 Precision Audio Reference Level
 Balanced and Unbalanced Outputs
 Operation from a 9 V Battery or 24 Vdc
 Connectorized Outputs
 Programmable +4 dBu or +6 dBu Output
 Portable or Bench Operation

The PT-ASG1 is part of the group of versatile and convenient portable
products from Radio Design Labs. The PT Series feature the superior
engineering and components common to RDL products. A stable internal
reference sets a new standard for accuracy in portable instruments. Durable
yet lightweight metal enclosures house superior circuitry for years of
unparalleled performance. Test leads and a bench top stand are included.
An optional carrying case (PT-IC1) and AC power adapter (North America;
PS-24S type, Continental; PS-24AX) are available.

APPLICATION: The PT-ASG1 is the ideal choice in
applications requiring a stable audio signal source for system
verification, alignment and testing.

The PT-ASG1 is a portable audio oscillator providing stable
output levels. The internal oscillator operates at 700 Hz
allowing aural monitoring of the signal without the fatigue
associated with oscillators running at a higher frequency such as 1 kHz. The 700 Hz signal is in the midrange
passband of the audio system while being easily distinguished from either 400 Hz or 1 kHz signals. The oscillator
circuit is FET controlled for stability. The oscillator output is compared against an internal temperature-stable
reference in a gain controlled loop that adjusts the final output level. The resulting output level stability is suited to
accurate bench top audio testing.

Two outputs are provided on the PT-ASG1. The XLR balanced output is front-panel switch selectable for MIC or
LINE level. The line level is factory set to +4 dBu, but can be programmed to provide +6 dBu. The level preset
(+4 / +6) switch is located in the battery compartment. When the front-panel level switch is set to MIC, the XLR
output level is set to -46 dBu, 50 dB below +4. The unique PT-ASG1 output network produces the equivalent output
level into low impedance (200 Ohms) and higher impedance (>1000 Ohms) mic preamps. This makes the PT-ASG1
the ideal signal source for 50 dB mic-to-line gain setup of any RDL module or other industry mic preamp. The
second output is a continuous -10 dBV on a phono jack. This signal is matched to consumer audio inputs or
modules with a -10 dBV unbalanced audio input.

The PT-ASG1 operates either from an internal 9 volt battery or from an external 12 Vdc to 30 Vdc supply. When
operated from the internal 9 volt battery, the LOW BATTERY LED glows steadily when less than one hour operating
time remains. The POWER ON LED is illuminated when the PT-ASG1 is operating from internal or external power.

The precise output stability, rugged construction and versatility make the PT-ASG1 the ideal portable or bench top
instrument for audio equipment level adjustment.

RDL  659. 6th St.  Prescott, AZ., USA 86301  [phone]  FAX [phone]  www.rdlnet.com

™

PT

SERIES

Model PT-ASG1
Audio Signal Generator

TOP DETAIL

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

HANGER BRACKET

FOR HANGING INSTRUMENT ON RACK

PANEL OR WITH A WIRE OR CABLE TIE

+4 or +6 dBu BALANC ED OUTPUT

SWITCHABLE MIC OR LINE LEVEL

-10 dBV UNBALANCED OUTPUT

EXTERNAL POWER JACK

12 VDC TO 30 VDC

POWER ON WHEN USING EXTERNAL SUPPLY
POWER OFF WHEN USING INTERNAL 9V BATTERY

POWER ON WHEN USING INTERNAL 9V BATTERY

SELECT MIC OR

LINE LEVEL

BALANCED OUTPUT

BOTTOM DETAIL

OUTPUT LEVEL CALIBRATION (FACTORY SET)

BALANCED OUTPUT SET TO +4 dBu

BALANCED OUTPUT SET TO +6 dBu

INSTALL 9V BATTERY IN COMPARTMENT

OUTPUT

-10

MIC/LINE

MIC

LINE

PRECISION ANALOG

AUDIO GENERATOR

PWR

12 - 24

VDC

EXT

BATT

LOW
BATTERY

POWER

ON

TYPICAL PERFORMANCE

Outputs (2): XLR (Mic or Line Level), Phono (Consumer Level)
Balanced Output Level (Selectable):
Line: +4 dBu (+6 dBu, switch selectable, 2.5 k load )
Mic: -46 dBu (2.5 k load, 50 dB below +4 dBu)
Unbalanced Output Level: -10 dBV
Oscillator Frequency: 700 Hz nominal
Output Stability: Better than 0.01 dB
Power Requirement: 9 V Internal, 12 to 30 Vdc External @ 20 mA
Dimensions:
Height: 5.22 in. 13.26 cm
Width: 2.81 in. 7.14 cm
Length: 1.39 in. 2.53 cm

EMC:

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-4000C

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287