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Receiver Operational Controls

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Depth measurement / 

frequency selection

Sensitivity control 

(increase sensitivity)

On/Off control

Sensitivity control 

(reduce sensitivity)

Increment sensitivity down, or auto scale 

down to 60% if off scale. When in frequency 

select menu use this button to scroll 

backwards through available frequencies.
Long press to switch on/off. Short press to 

change speaker volume.
Increment sensitivity up, or auto scale to 

60% if off scale. When in frequency select 

menu use this button to scroll forwards 

through available frequencies.
Short press to initiate depth measurement. 

Long press to enter frequency select menu 

then short press to exit menu.

D18-33kHz Sonde

•  0.75in 

(18mm)

 x 3.1in 

(80mm)

 long,

   33 kHz, range 15ft 

(4.5m)

•  2 x button cell batteries

D38-33kHz Sonde

•  1.5in 

(38mm)

 x 4.1in 

(105mm)

 long,

   33 kHz, range 16.3ft 

(5m)

•  1 x AA battery

D64-33kHz Sonde

•  2.5in 

(64mm)

 x 7.3in 

(186mm)

 long,

   33 kHz, range 26ft 

(8m)

•  1 x LR61 battery

D23F Flexible Sonde.

 

Available in 512Hz or 640Hz

•  1in 

(23mm)

 x 18in 

(456mm)

 long,

   range 20ft 

(6m)

•  Flexible (3 section) Sonde for use in 

   metallic or non-metallic pipes

•  1 x AA battery

Optional Accessories Sondes

NOTE

The battery condition is indicated on the battery icon. 

Replace batteries if necessary. See Changing Batteries 

Section.

Power Mode Operation

Switch on the receiver by pressing the On/Off pushbutton. Allow the unit 

a few seconds to switch on.

The frequency selected is shown on the display. If this is not the desired 

locate frequency (i.e. 50 or 60Hz) change as instructed below.

Changing the Locate Frequency

Press and hold the depth measurement/frequency selection pushbutton

until the frequency menu is entered. The display will show the present 

frequency selected in large numbers in the center of the screen. Use the 

“+” or “–” pushbuttons to select the desired frequency. Press the depth 

measurement/frequency selection pushbutton to re-enter the locate 

screen.

Locating a Cable in the Power (50/60Hz) Mode

Hold the locator vertically in the area that is required to be searched. 

Adjust the sensitivity of the locator by pressing the “+” or “–” pushbuttons 

to keep the locator response on scale. 

Hold the locator in front of you in the orientation shown below. 

Sweep the locator left to right along the suspected route of the cable. As 

the locator approaches the cable the meter reading will increase. 

Pinpoint the position by detecting the largest signal.

To confirm the direction of the cable, rotate the locator until the largest 

signal is detected. The direction of the cable is then directly ahead, 

pointing forward, away from the display.

Continue to locate the cable along the route. Depth measurements are 

not possible in the power (50/60Hz) mode, if pressed by accident it will 

show N/A.

WARNING

The power mode is used to detect signals radiating 

from cables or services that are carrying a 50 or 

60Hz load. It is possible for a cable to be live but not 

carry a load. In this case there may not be a signal to 

be detected.

Similarly, if a cable is exactly balanced the resulting 

signal radiating from the cable may be zero and 

therefore not detectable.

Do not use the VM-540 to identify cables if they are 

live. Always dig with caution.

Sonde Locating

Connect the Sonde to a suitable push rod. There is typically a 10mm 

thread on the end of the Sonde for this purpose.

Switch on the Sonde and position it within the pipe access chamber 

leaving it still visible. 

Hold the locator above the Sonde at ground level. Adjust the sensitivity 

of the locator by pressing the “+” or “-” pushbuttons to keep the signal on 

scale. Rotate the receiver until the maximum signal is detected.

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