MGL Avionics Blaze ALT-7 User manual

Introduction
The ALT-7 is a 3 1/8” (80mm) sunlight readable encoding altimeter and a wide range ertical speed indicator.
The altimeter contains an internal high accuracy 24 bit digital altitude sensor which calculates altitude from -1500 ft up to
a maximum of +35000 ft. The ALT-7 outputs arious formatted RS232 serial data protocols compatible with serial input
transponders such as that from Garmin, Magellan, Northstar, Trimble, Microair etc. The altimeter can display altitude in
feet or meters and local pressure can be set in millibars or inches of mercury.
The VSI indicator can be displayed in either feet/minute (ft/min) or meters/second (m/s). The VSI can be calibrated by the
user once the instrument has been installed in the aircraft.
The ALT-7 also pro ides a transponder compatible Serial RS232 and parallel Gillham code output and also features a
user settable altitude bug and an encoder test function.
1 Features
•Large 2.6” high resolution 320x240, IPS (fully viewa le in all directions), sunlight reada le color LCD
display
• An internal high accuracy 24 bit digital altitude sensor calculates altitude from –1500 ft up to a maximum
of 35000 ft (-457m to 10668m)
• The ALT-7 outputs various formatted RS232 serial data protocols compatible with serial input
transponders such as that from Garmin, Magellan, Northstar, Trimble, Microair etc.
• Provides a parallel Gillham code output for transponders
• Built in encoder test function
• The altimeter can display altitude in feet or meters
• Local pressure can be set in millibars or inches of mercury
• Contains a wide range VSI indicator from /-20 ft/min to as high as /-10000 ft/min
• VSI units can be in feet/minute (ft/min) or in meters/second (m/s)
• User settable altitude bug with deviation band / level alarm
• Standard 3 1/8” (80mm) aircraft enclosure (can be front or rear mounted)
• The LED backlight can automatically adjust to the ambient light, or it can be manually adjusted in the
menu system
• Rotary control plus 2 independent buttons for easy menu navigation and user input
• Wide input supply voltage range of 8 to 30V DC
• 1 year limited warranty
Blaze ALT-7
Altimeter and Vertical Speed Indicator
with a transponder compatible serial
RS232 & parallel Gillham code output
Operating Manual – English 1.07

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2 Layout
3 Main Displays
The ALT-7 has 2 different display screens. The main display screen can be selected in the “ALT SETUP” menu.
3.1 Altitude "TAPE" Display
F2 / Down Button:
Menu system: Softkey button
Normal display: Altitude
bug setting display
Sunlight readable color graphic display:
The backlight can automatically adjust
to the ambient light or it can be manually
adjusted in the menu system
Rotary Control (Up/Down) & Enter Button:
Press the rotary control during the normal display screens to access the menu system. Rotate anti/clockwise
for up/down menu scrolling. Rotate the rotary control during the normal display mode to adjust the local
pressure. Local pressure can be set in either mB or in “Hg.
F1 / Up Button:
Menu system: Softkey button
Normal display: Enable/disable
altitude bug
3 1/8” (80mm) enclosure.
Can be front or rear mounted
VSI scale indication
VS I (Vertical Speed Indication)
VSI unit
Altitude Tape
Altitude Value
Altitude Bug
Local pressure readout (Either in mB or in “HG)
VSI Value
Altitude unit
Ambient light sensor

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3.2 Altitude "CLASSIC" Display
3.3 Altitude Bug
Press the F2/Down button during the altitude “TAPE” display to access the altitude bug setting screen. Press the F1/UP
key to set the altitude bug to the current altitude or use the rotary control to adjust the altitude bug. Press the F2/Down
key to change the increment / decrement unit to 50 or 500. Press the rotary control to exit and sa e.
Press the F1/Up button during the normal altitude “TAPE” display to enable or disable the altitude bug. The bug will be
yellow when in the display screen and cyan when either abo e or below the limits of the display.
3.4 Deviation Band
Use the rotary control to adjust the altitude de iation band. Press the F2/Down key to change the increment / decrement
unit to 50 or 100. Press the rotary control to exit and sa e.
VSI Value
VSI unit
Altitude unit
Altitude Value
VSI scale indication
VSI (Vertical Speed Indication)
Local pressure readout (Either in mB or in “HG)

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4 Menu System
Press the rotary control button during the normal display mode to enter the menu system. Use the rotary control to
na igate through the menu system.
4.1 Exiting the menu system
Press the F1/Up button to exit the menu system when the “EXIT” soft key is shown. All changes made during na igation
of the menu system will be sa ed in non- olatile memory upon exiting. The instrument will not sa e any changes if you
remo e power before exiting the menu system.

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4.2 ALT Setup (Altitude Setup)
Style:
Select the altitude display screen. Options include “TAPE” or “CLASSIC”.
Altitude Unit:
Select if you want the altitude displayed in ft (feet) or m (meters).
Pressure Unit:
Select if you want the local pressure displayed in mb (millibars) or “Hg (inches of mercury).
Resolution:
Select the resolution of the altitude alue, a selection of 1,10,25 or 100 ft or m can be selected.
Alarm:
Select “DEVIATION” if you want the alarm to acti ate if the altitude exceeds the de iation limit band around the altitude
bug, or “LEVEL” if you want the alarm to acti ate if the altitude exceeds the altitude bug.
ALT Calibrate
This section allows for the calibration and fine tweaking of the altitude alue. Before you begin, ensure that your calibrated
and certified reference is set to the local pressure of 1013.25mB (29.92”Hg). The ALT-6 altitude alue in ft (referenced to
1013.25mB (29.92”Hg)) is displayed in the top right hand corner of the display. All calibration must be done in feet.
The combined adjustments cater for both the altitude sensors offset and gain. Only start the calibration sequence once
the instrument has been running for a minimum of 10 minutes.
Start the altitude calibration with the “CAL FACTOR” and make sure the “CAL GAIN” alue is set to 100.00%.

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Cal Factor:
This is the pressure sensor offset in 0.1mB increments. Adjust your static pressure to be close to sea le el pressure. The
exact altitude is not important and can be up to se eral hundred feet. Adjust the calibration factor so the altitude readout
in the top right hand corner of the display agrees with your pitot static test set.
Cal Gain:
Once you are satisfied that the low le el altitude “CAL FACTOR” is correct, apply a static pressure that will result in an
altitude between 20000 and 30000 ft. Adjust the “CAL GAIN” until the altitude readout in the top right hand corner of the
display agrees with your pitot static test set
NOTE: Adjusting the “CAL GAIN” also changes the low le el altitude calibration achie ed when adjusting the “CAL
FACTOR”. Please recheck your low le el altitude calibration and adjust if necessary. Recheck your altitude readout at the
higher altitude, and if needed slightly adjust the “CAL GAIN” again. Repeat the process until you are satisfied with both
the “CAL FACTOR” altitude and the “CAL GAIN” altitude.
Serial Out:
Select “ON” to enable the RS232 serial altitude output. This formatted serial RS232 message can be directly interfaced to
arious RS232 serial input transponders.
Prot:
Select the protocol of the serial RS232 output message. The protocol can be selected between GARMIN AT, Magellan,
Northstar / Garmin, Trimble / Garmin, MGL A ionics and Microair UAV. Please note that the baud rate is automatically
adjusted according to which protocol is selected. The output format is as follows. The message contains the current
pressure altitude with a fixed reference to 1013.25mB (29.92 inches mercury). All protocols use 8 databits, no parity, and
1 stop bit. The message is outputted once a second.
Protocol Baud
Rate
Message format Example
Garmin AT 1200 #AL, space, +/-, fi e altitude digits right
justified zero padded, T+25, checksum,
carriage return
The checksum is a simple modulo 256 sum
of the binary alues of the indi idual
characters. The checksum is sent as two
characters in hexadecimal format
#AL +02372T+25DF[CR]
Magellan 1200 #MGL, +/-, fi e altitude digits right justified
zero padded, T+25, checksum, carriage
return
The checksum is a simple modulo 256 sum
of the binary alues of the indi idual
characters. The checksum is sent as two
characters in hexadecimal format
$MGL+02372T+2513[CR]
Northstar,
Garmin
4800 ALT, space, fi e altitude digits right justified
zero padded, carriage return
ALT 02372[CR]
Trimble, 9600 ALT, space, fi e altitude digits right justified ALT 02372[CR]

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Garmin
GTX327,
GTX328,
GTX330
(Set on Icarus)
zero padded, carriage return
MGL A ionics 9600 ALT, +/-, fi e altitude digits right justified
zero padded ,1013.25mB (29.92”Hg)
referenced, C, +/-, fi e altitude digits right
justified zero padded (corrected to local
pressure), L, local pressure setting in
millibars,+/-, four digit VSI reading right
justified zero padded in ft/min, X,
checksum, carriage return
The checksum is a simple modulo 256 sum
of the binary alues of the indi idual
characters. The checksum is sent as two
characters in hexadecimal format
ALT+02372C+02372L1013+0000XCA[
CR]
Microair UAV 9600 STX,a,=, fi e altitude digits right justified
zero padded, ETX
[STX]a=02372[ETX]
Infiniteq 57600 See Infiniteq protocol format below
STX=0x02
ETX=0x03
CR=0x0D
Infiniteq protocol format:
STX, Address, Message type, Length, Data payload, Checksum, ETX
STX: Start of text (0x02)
Address: unsigned char (8bit), (0x01)
Message Type: unsigned char (8bit), (0x05)
Length: unsigned char (8bit), Length of the data payload (does not include the STX, Address, message type, checksum or
ETX), (0x06)
Data payload:
Altitude: Signed Long (32 bit), Altitude in feet (Referenced to 1013.25mB)
Vertical Speed: Signed Int (16 bit), Vertical Speed in ft/min
Checksum: unsigned char (8bit), XOR of all bytes starting from the unit address to the end of the data payload. The
checksum is seeded with 0xa5. (does not include the STX or ETX)
ETX: End of text (0x03)

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Test Alt Encoder:
This is a handy function to test the ALT-7 transponder interface once the installation has been completed. The serial
output will output specific altitudes which can then can be used to test the serial RS232 output and the parallel gillham
output. The ALT-7 will resume the normal output of the indicated altitude upon exiting the test function.
The following codes are outputted:
Altitude D4 A1 A2 A4 B1 B2 B4 C1 C2 C4
-1000ft 0 0 0 0 0 0 0 0 1 0
-900ft 0 0 0 0 0 0 0 1 1 0
-700ft 0 0 0 0 0 0 1 1 0 0
-400ft 0 0 0 0 0 0 1 0 1 1
-200ft 0 0 0 0 0 1 1 0 0 1
800ft 0 0 0 0 1 1 0 0 0 1
2800ft 0 0 0 1 1 0 0 0 0 1
6800ft 0 0 1 1 0 0 0 0 0 1
14800ft 0 1 1 0 0 0 0 0 0 1
30800ft 1 1 0 0 0 0 0 0 0 1
Each altitude reporting code line must be tested for integrity of connection if at any time the aircraft connections to the
transponder or altitude data source ha e been remo ed and reconnected. Integrity of the connections may be erified by
performing a test of mode C function of the transponder system.
Warning: Do not use this function while in flight as incorrect altitude information will be sent to
the transponder.

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4.3 VSI Setup (Vertical Speed Indicator Setup)
VSI isplay:
Select if you want the VSI display to be shown on the altitude “TAPE” display. The VSI display is always shown on the
altitude “CLASSIC” display.
VSI Unit:
Select if you want the VSI to be displayed in "ft/min" (feet/minute) or "m/s" (meters/second).
Scale:
Select the VSI scale most suited for your aircraft.
VSI Cal:
This is a function that is used to calibrate your VSI to read exact rates of climb or decent. This function works as a
percentage of initial reading. The default setting for this function is 100%. Increasing this alue increases the VSI reading
and decreasing the alue decreases the reading.
Suggested VSI calibration method
After you ha e installed the instrument, perform a calibration flight. This should be done in ery calm conditions.
Turbulence and thermal acti ity will make accurate calibration impossible. Many areas ha e ideal conditions during early
mornings or late afternoons. Place the instrument in ft/min for ease of calibration. Take your aircraft to a few
thousand feet abo e ground and start a glide with a low power setting. Take a stopwatch and when the glide is stable
(stable VSI reading) start the stopwatch. Take note of your altimeter reading at the same time. Continue the stable glide
for one minute exactly. After the minute has finished, take another reading of your altimeter.
Example:
VSI reading during stable glide: -400 ft/min
Start altitude: 2500 ft.
End altitude: 2050 ft.
In the abo e example the VSI is under reading by about 12%. Set your VSI calibration to 112% to cancel out the error.

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4.4 MISC Setup (Miscellaneous Setup)
Backlight:
Select manual or automatic backlight control.
Use the rotary control in manual mode to adjust the backlight brightness.
Allow 3 seconds for the display to adjust to the ambient lighting conditions when using
the automatic backlight mode. The display will set the backlight to the dim setting if the
ambient light is less then the threshold setting, alternati ely the display will set the
backlight to the bright setting if the ambient light is greater then the threshold setting. The
ambient light recei ed is shown as the ADC alue in the top header. Use this alue to set
the threshold alue.
Security Setup:
Select this menu option if you want to password protect the menu system.

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Information:
This menu option displays information about the unit.
efault Settings:
Select this menu option to reset all the settings to factory defaults.
5 Loading factory default settings
Press and hold the F1/Up button and rotary control during power up to load the pre-
programmed factory default settings. The following screen will be displayed:
Factory default settings can also be loaded in the Miscellaneous setup menu.

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6 Error Messages
Unit settings CRC error. Load default settings to restore to factory defaults. If the error
message still persists then it could possibly be a non- olatile memory failure in which
case the instrument will then ha e to be returned to the factory.
Calibration constants CRC error. The instrument could possibly ha e a non- olatile
memory failure in which case the instrument will then ha e to be returned to the factory.
Internal flash CRC error. The instrument does a firmware check on the program when
power is applied to the instrument . If the program is corrupt in any way then the internal
flash CRC error will be displayed. Reload the instruments firmware and load default
settings. If the error message still persists then it could possibly be an internal flash
memory failure in which case the instrument will then ha e to be returned to the factory.
Altitude sensor error. The instrument could ha e a faulty altitude sensor in which case
the instrument will then ha e to be returned to the factory.

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7 Specifications
Operating Temperature Range -10ºC to +55ºC (14ºF to 131ºF)
Storage Temperature Range -20ºC to 80ºC (-4ºF to 176ºF)
Humidity <85% non-condensing
Power Supply 10 to 30Vdc
Current Consumption Approx. 125mA @ 12V (backlight highest setting), 45mA @12V (backlight
lowest setting)
Display
2.6” 320x240 IPS color LCD display
Minimum 600cd/m2 brightness
Sunlight readable with anti-glare coating
LED Backlight can be set to automatic or can be manually adjusted
Alarm Output Open collector transistor switch to ground
Maximum rating 0.25A
Dimensions see Blaze series dimensional drawing
Enclosure 3 1/8” (80mm) ABS, black in color, front or rear mounting. Flame retardant.
Weight Approx. 180 grams (Instrument excluding cables)
Non-volatile memory storage 100000 write cycles
Altitude sensor ADC resolution 24 bit
Altimeter range -1500ft to +35000ft (-457m to +10668m)
Altitude units ft or m
Baro Correction Range (inHg) 28.00 to 31.00 “Hg
Baro Correction Range (mB) 946 to 1050 mb
Pressure units “Hg or mb
VSI range +-20ft/min to +-10000ft/min
VSI units ft/min or m/s
Serial Port RS232 oltage le els
Calibration interval 1 Year
Gillham code port D15F connector (Cable is Male), Open collector darlington dri ers
8 Operating the alarms
The alarm output can be used to switch an external alarm indicator. The external alarm switch is an open collector
transistor switch to ground with a maximum rating of 0.25A DC. It is possible to wire the alarm contacts of se eral
instruments in parallel should this be desired.
9 Firmware Upgrading
The ALT-7 can be upgraded in the field by connecting the RS232 port to a PC and running the firmware update program.
Note that only the RS232 port can be used to upgrade the firmware.
Please see the Blaze firmware upgrading document for more information.

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10 Installation
Connect the static port to a suitable static air pressure line. If you ha e a slow aircraft or an aircraft were the internal cabin
pressure does not change during flight and is equi alent to the outside air pressure you may find that it is not required to
connect a static port.
For installations in typical ultralight aircraft pods, be aware of possible pressure changes inside the pod during flight
caused by ram air or suction effects. This may lead to a false indication of altitude. Often these effects are dependent on
the current angle of attack of the airflow around your pod. You will need to install a suitable static port in these cases.
The ALT-7 static pressure port takes 4mm ID tubing. Use hose clamps to fasten the hose onto the ALT-7 static port.
10.1 Gillham Encoder transponder interface
The ALT-7 altimeter will measure altitudes typically to around 42 000 ft, howe er, this requires a transponder that uses
signal D4. Transponders that do not ha e D4 can only transmit altitudes up to 35000 ft. If your transponder only accepts
codes A1 to C4 then you lea e signal D4 unconnected. The ALT-7 produces in erted Gillman codes as required by
irtually all transponders. The outputs are open collector types and will sink currents up to a few mA.
It is recommended to use shielded cable for the connection between the ALT-7 and the transponder if a long cable needs
to be used. The shield should be connected to ground at one point only (either on the encoding altimeter side or on the
transponder side).
The ALT-7 will switch all output dri ers off if an error has occurred with the altitude sensor.
Important information
Depending on laws and regulations in your country you may not be allowed to install a transponder and associated
equipment yourself. This work may ha e to be done by a certified AMO or instrument technician.
Please check with your rele ant authorities.
The ALT-7 encoding altimeter is uncertified equipment and may normally only be used in uncertified aircraft, homebuilt
aircraft and microlights (ultralights). Special operations permits for other aircraft may be required. Please be ery aware
that any wiring mistake related to the application of Gillham codes to your transponder will result in incorrect altitudes
broadcast by your transponder. Any installation in ol ing the ALT-7 must be checked by a suitably equipped aircraft
instrument maintenance outfit before operation. Failure to do this may be a criminal offence in your country.
Attention:
Your country may ha e regulations that do not allow you to install a transponder or an encoding altimeter
yourself. The installation may ha e to be performed by an authorized person or company. Please check
your applicable regulations with your a iation authorities.

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Pinouts for various transponders
The ALT-7 has a parallel output Gillham interface that can be directly connected to arious parallel input transponders
such as those from Garmin, Becker, King, Microair, etc. The output data contains the current pressure altitude with a fixed
reference to 1013.25mB (29.92 inches mercury). The following table is of commonly used transponders and their Gillham
code connections. Please consult your transponders installation manual on the physical position of e ery contact. Ensure
that you wire the Gillham codes correctly and securely.
Transponder A1 A2 A4 B1 B2 B4 C1 C2 C4
ARC RT359A/459A/859A 14 13 15 19 17 16 21 18 20
BECKER ATC 2000/3401 16 15 14 17 19 18 22 21 20
BECKER ATC 4401 1 2 3 14 15 16 17 18 19
BENDIX TRP-2060/2061/660 4 6 8 9 10 11 3 5 7
BENDIX TR541A/641B A B C D E F H J K
COLLINS TDR-950/950L 12 10 7 6 5 4 8 11 9
EDO-AIRE RT-777 7 5 3 12 13 14 8 6 4
GARMIN 320/320A/327 3 5 6 9 11 12 10 4 7
GENAVE BETA 5000 4 5 6 7 8 9 10 11 12
KING KT76/78 6 7 9 4 1 2 3 8 10
KING KT76A/78A/76C/79 M K J E C B D L H
KING 750A G H J K L M P R S
KING KT75 6 7 8 9 10 11 12 13 14
MICROAIR T2000 9 10 11 12 13 17 18 19 20
NARCO AT50/50A/150 7 6 8 12 10 9 14 11 13
NARCO AT5/6/6A 2 4 8 9 10 11 1 3 5
RADAIR 250 7 6 13 9 10 11 14 16 12
TERRA TRT250/250D 5 17 16 15 2 14 3 4 18
UPS/APPLLO SL70 13 31 12 33 14 32 16 34 15
WILCOX 1014A K C W T L D P F Z

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10.2 Connection Diagram
The use of an external 1A fuse is recommended. Connect the supply terminals to your aircrafts power supply. The ALT-7
can be used on both 12V and 24V without the use of any pre-regulators. Ensure that the supply oltage will not drop
below 8V during operation as this may result in incorrect readings.

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10.3 Cable connections
Main connector (D15HD) connector: Unit Female, Cable Male)
Encoder Interface connector (D15 Unit Female, Cable Male)
The Gillham code signals are on the grey flat ribbon cable. Note that one side on the cable is marked with a red line to
indicate pin 1.
D15HD Pin Color Function
1 Red 8-30Vdc power via power switch / circuit
breaker and fuse.
2 Black Ground.
3 White/Blue
Stripe
RS232 Transmit data (Firmware upgrading /
RS232 Altitude output)
4 - RS232 Receive data (Firmware upgrading)
15 White Alarm Output (Open collector)
D15 Pin Color Function
1 Red Stripe /
Grey
Gillham Output D4
2 Grey Gillham Output A1
3 Grey Gillham Output A2
4 Grey Gillham Output A4
5 Grey Gillham Output B1
7 Grey RS232 Transmit output
9 Grey Gillham Output B2
10 Grey Gillham Output B4
11 Grey Gillham Output C1
12 Grey Gillham Output C4
13 Grey Gillham Output C2
15 Grey Ground

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11 Dimensions

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12 Cleaning
The unit should not be cleaned with any abrasi e substances. The screen is ery sensiti e to certain cleaning materials
and should only be cleaned using a clean, damp cloth.
13 Warranty
This product carries a warranty for a period of one year from date of purchase against faulty workmanship or defecti e
materials, pro ided there is no e idence that the unit has been mishandled or misused. Warranty is limited to the
replacement of faulty components and includes the cost of labor. Shipping costs are for the account of the purchaser.
14 Disclaimer
Operation of this instrument is the sole responsibility of the purchaser of the unit. The user must make themsel es familiar
with the operation of this instrument and the effect of any possible failure or malfunction.
This instrument is not certified by the FAA. Fitting of this instrument to certified aircraft is subject to the rules and
conditions pertaining to such in your country. Please check with your local a iation authorities if in doubt. This instrument
is intended for ultralight, microlight, home built and experimental aircraft. Operation of this instrument is the sole
responsibility of the pilot in command (PIC) of the aircraft. This person must be proficient and carry a alid and rele ant
pilot’s license. This person has to make themsel es familiar with the operation of this instrument and the effect of any
possible failure or malfunction. Under no circumstances does the manufacturer condone usage of this instrument for IFR
flights.
IMPORTANT NOTICE:
You must make your own determination if the products sold by MGL A ionics are safe and effecti e for your intended
applications. MGL A ionics makes no representations or warranties as to either the suitability of any of the products we
sell as to your particular application or the compatibility of any of the products we sell with other products you may buy
from us or anywhere else, and we disclaim any warranties or representations that may otherwise arise by law. Also, we
offer no specific ad ice on how to install any of the products we sell other than passing along anything that may ha e
been pro ided to us by the manufacturer or other issues. If you are in need of further information or guidance, please turn
to the manufacturer, FAA Ad isory Circulars and guidance materials, the Experimental Aircraft Association, or other
reputable sources.
Note: Product warranty excludes damages caused by unprotected, unsuitable or incorrectly wired
electrical supplies and or sensors, and damage caused by inducti e loads.
Warning: The ALT-7 is not waterproof, serious damage could occur if the unit is exposed to
water and/or spray jets.
Continuing development sometimes necessitates specification changes without notice.

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Other instruments in the Stratomaster Blaze series
AHRS-2 Artificial Horizon and Magnetic Compass Indicator
AHRS-4 Self contained Artificial Horizon and Magnetic Compass Indicator
ALT-6 Altimeter and Vertical Speed Indicator (VSI)
ALT-7 Altimeter and Vertical Speed Indicator (VSI) with a transponder compatible RS232 &
parallel Gillham code output
ASI-5 Airspeed Indicator (ASI)
ASV-2 Altimeter, Airspeed (ASI) and Vertical Speed Indicator (VSI)
EMS-2 Engine Monitoring System
FF-5 Fuel Computer
FLIGHT-3 Primary Flight Instrument
INFO-2 Information Display (G-Force meter, UTC and Local Time, Slip Indicator, Outside Air
Temperature (OAT), Battery Voltage, Current and charge display, Flight Timer & Flight
Log, Stopwatch, Countdown Timer and Alarm)
MAG-2 Magnetic Compass Indicator
MAP-4 Manifold Pressure and RPM Indicator
RPM-2 Uni ersal Engine / Rotor RPM Indicator
TC-5 4 Channel Thermocouple (EGT/CHT) Indicator
TC-6 12 Channel Thermocouple (EGT/CHT) Indicator
TP-4 4 Channel Uni ersal Analog Input (Pressure/Temperature/Current/Volts) Indicator