PPT created for OER creation

1. Digital Voltmeter
by
S D Ruikar

2. Introduction to DVM

3. Advantages

4. RAMP type DVM

5. Timing Diagram of Ramp type DVM

6. RAMP type DVM

7. RAMP type DVM

8. DVM
• A digital voltmeter, or DVM, is used to take highly accurate
voltage measurements. These instruments measure the
electrical potential difference between two conductors in a
circuit. DVMs are electric voltmeters, and the preferred
standard, as they offer several benefits over their analog
counterparts.
• Voltmeters are used to measure the gain or loss of voltage
between two points in a circuit. The leads are connected in
parallel on each side of the circuit being tested. The
positive terminal of the meter should be connected closest
to the power supply. In turn, the negative terminal would
be connected after the circuit being tested. The analog dial
or digital display will exhibit the voltage measurement.

9. DVM
• A digital voltmeter typically consists of an analog to digital converter (A/D) with a
digital display. The analog signal is converted into a digital code proportionate to
the magnitude of the signal. Voltages from picovolts to megavolts are measurable,
though the scale usually graduates in millivolts, volts, or kilovolts. Frequencies
between zero and several megahertz may also be measured. DVMs measure both
alternating current (AC) and direct current (DC) in electronics.
• Common laboratory and commercial applications involve electromechanical
machinery with a current flowing through wires and circuits. Often, a digital
voltmeter is used to monitor a unit, such as a generator.
• Portable or handheld devices, such as the digital multimeter (DMM), for example,
may combine several functions into one instrument measuring voltage, current,
and resistance. This is the preferred tool of an electrician. Many DVMs integrate
outputs for monitoring, controlling, transmitting, and printing of data.
• Advanced systems are often connected to computers, allowing for automation,
optimization of processes, and prevention of malfunctions and critical failure
safeties. Chemical plants can convert measurements to voltage, and control and
monitor temperature, pressure, level, or flow. Medical equipment, such as x-ray
machines, may use a digital voltmeter to make sure the voltage of the equipment
is in the proper range.

10. ICL7106 and ICL7107
• The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2
digit A/D converters. Included are seven segment decoders, display
drivers, a reference, and a clock.
• The ICL7106 is designed to interface with a liquid crystal display (LCD) and
includes a multiplexed backplane drive; the ICL7107 will directly drive an
instrument size light emitting diode (LED) display.
• The ICL7106 and ICL7107 bring together a combination of high accuracy,
versatility, and true economy.
• It features auto zero to less than 10µV, zero drift of less than 1µV/°C, input
bias current of 10pA (max) and rollover error of less than one count.
• True differential inputs and reference are useful in all systems, but give the
designer an uncommon advantage when measuring load cells, strain
gauges and other bridge type transducers.
• Finally, the true economy of single power supply operation (ICL7106),
enables a high performance panel meter to be built with the addition of
only 10 passive components and a display.

11. ICL7106, ICL7107, ICL7107S
Features
• Guaranteed zero reading for 0V input on all scales
• True polarity at zero for precise null detection
• 1pA typical input current
• True differential input and reference, direct display drive
– LCD ICL7106, LED lCL7107
• Low noise - less than 15µVP-P
• On-chip clock and reference
• Low power dissipation - typically less than 10mW
• No additional active circuits required
• Enhanced display stability
• Pb-free (RoHS compliant)

12. ICL7106 and ICL7107

13. ICL7106 and ICL7107

14. Design Information Summary Sheet

15. Design Information Summary Sheet

17. • Thanking You